diff options
Diffstat (limited to 'arch/hexagon/mm')
| -rw-r--r-- | arch/hexagon/mm/Makefile | 6 | ||||
| -rw-r--r-- | arch/hexagon/mm/cache.c | 139 | ||||
| -rw-r--r-- | arch/hexagon/mm/copy_from_user.S | 114 | ||||
| -rw-r--r-- | arch/hexagon/mm/copy_to_user.S | 92 | ||||
| -rw-r--r-- | arch/hexagon/mm/copy_user_template.S | 185 | ||||
| -rw-r--r-- | arch/hexagon/mm/init.c | 283 | ||||
| -rw-r--r-- | arch/hexagon/mm/ioremap.c | 57 | ||||
| -rw-r--r-- | arch/hexagon/mm/pgalloc.c | 23 | ||||
| -rw-r--r-- | arch/hexagon/mm/strnlen_user.S | 139 | ||||
| -rw-r--r-- | arch/hexagon/mm/uaccess.c | 59 | ||||
| -rw-r--r-- | arch/hexagon/mm/vm_fault.c | 202 | ||||
| -rw-r--r-- | arch/hexagon/mm/vm_tlb.c | 93 |
12 files changed, 1392 insertions, 0 deletions
diff --git a/arch/hexagon/mm/Makefile b/arch/hexagon/mm/Makefile new file mode 100644 index 000000000..1a0be4d57 --- /dev/null +++ b/arch/hexagon/mm/Makefile @@ -0,0 +1,6 @@ +# +# Makefile for Hexagon memory management subsystem +# + +obj-y := init.o pgalloc.o ioremap.o uaccess.o vm_fault.o cache.o +obj-y += copy_to_user.o copy_from_user.o strnlen_user.o vm_tlb.o diff --git a/arch/hexagon/mm/cache.c b/arch/hexagon/mm/cache.c new file mode 100644 index 000000000..a7c6d827d --- /dev/null +++ b/arch/hexagon/mm/cache.c @@ -0,0 +1,139 @@ +/* + * Cache management functions for Hexagon + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include <linux/mm.h> +#include <asm/cacheflush.h> +#include <asm/hexagon_vm.h> + +#define spanlines(start, end) \ + (((end - (start & ~(LINESIZE - 1))) >> LINEBITS) + 1) + +void flush_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleaninva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + +void flush_icache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleana(%0); " + " icinva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + __asm__ __volatile__ ( + "isync" + ); + local_irq_restore(flags); +} +EXPORT_SYMBOL(flush_icache_range); + +void hexagon_clean_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dccleana(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + +void hexagon_inv_dcache_range(unsigned long start, unsigned long end) +{ + unsigned long lines = spanlines(start, end-1); + unsigned long i, flags; + + start &= ~(LINESIZE - 1); + + local_irq_save(flags); + + for (i = 0; i < lines; i++) { + __asm__ __volatile__ ( + " dcinva(%0); " + : + : "r" (start) + ); + start += LINESIZE; + } + local_irq_restore(flags); +} + + + + +/* + * This is just really brutal and shouldn't be used anyways, + * especially on V2. Left here just in case. + */ +void flush_cache_all_hexagon(void) +{ + unsigned long flags; + local_irq_save(flags); + __vmcache_ickill(); + __vmcache_dckill(); + __vmcache_l2kill(); + local_irq_restore(flags); + mb(); +} + +void copy_to_user_page(struct vm_area_struct *vma, struct page *page, + unsigned long vaddr, void *dst, void *src, int len) +{ + memcpy(dst, src, len); + if (vma->vm_flags & VM_EXEC) { + flush_icache_range((unsigned long) dst, + (unsigned long) dst + len); + } +} diff --git a/arch/hexagon/mm/copy_from_user.S b/arch/hexagon/mm/copy_from_user.S new file mode 100644 index 000000000..7fc94f3e6 --- /dev/null +++ b/arch/hexagon/mm/copy_from_user.S @@ -0,0 +1,114 @@ +/* + * User memory copy functions for kernel + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* + * The right way to do this involves valignb + * The easy way to do this is only speed up src/dest similar alignment. + */ + +/* + * Copy to/from user are the same, except that for packets with a load and + * a store, I don't know how to tell which kind of exception we got. + * Therefore, we duplicate the function, and handle faulting addresses + * differently for each function + */ + +/* + * copy from user: loads can fault + */ +#define src_sav r13 +#define dst_sav r12 +#define src_dst_sav r13:12 +#define d_dbuf r15:14 +#define w_dbuf r15 + +#define dst r0 +#define src r1 +#define bytes r2 +#define loopcount r5 + +#define FUNCNAME __copy_from_user_hexagon +#include "copy_user_template.S" + + /* LOAD FAULTS from COPY_FROM_USER */ + + /* Alignment loop. r2 has been updated. Return it. */ + .falign +1009: +2009: +4009: + { + r0 = r2 + jumpr r31 + } + /* Normal copy loops. Do epilog. Use src-src_sav to compute distance */ + /* X - (A - B) == X + B - A */ + .falign +8089: + { + memd(dst) = d_dbuf + r2 += sub(src_sav,src) + } + { + r0 = r2 + jumpr r31 + } + .falign +4089: + { + memw(dst) = w_dbuf + r2 += sub(src_sav,src) + } + { + r0 = r2 + jumpr r31 + } + .falign +2089: + { + memh(dst) = w_dbuf + r2 += sub(src_sav,src) + } + { + r0 = r2 + jumpr r31 + } + .falign +1089: + { + memb(dst) = w_dbuf + r2 += sub(src_sav,src) + } + { + r0 = r2 + jumpr r31 + } + + /* COPY FROM USER: only loads can fail */ + + .section __ex_table,"a" + .long 1000b,1009b + .long 2000b,2009b + .long 4000b,4009b + .long 8080b,8089b + .long 4080b,4089b + .long 2080b,2089b + .long 1080b,1089b + .previous diff --git a/arch/hexagon/mm/copy_to_user.S b/arch/hexagon/mm/copy_to_user.S new file mode 100644 index 000000000..0cfbcc09d --- /dev/null +++ b/arch/hexagon/mm/copy_to_user.S @@ -0,0 +1,92 @@ +/* + * User memory copying routines for the Hexagon Kernel + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* The right way to do this involves valignb + * The easy way to do this is only speed up src/dest similar alignment. + */ + +/* + * Copy to/from user are the same, except that for packets with a load and + * a store, I don't know how to tell which kind of exception we got. + * Therefore, we duplicate the function, and handle faulting addresses + * differently for each function + */ + +/* + * copy to user: stores can fault + */ +#define src_sav r13 +#define dst_sav r12 +#define src_dst_sav r13:12 +#define d_dbuf r15:14 +#define w_dbuf r15 + +#define dst r0 +#define src r1 +#define bytes r2 +#define loopcount r5 + +#define FUNCNAME __copy_to_user_hexagon +#include "copy_user_template.S" + + /* STORE FAULTS from COPY_TO_USER */ + .falign +1109: +2109: +4109: + /* Alignment loop. r2 has been updated. Return it. */ + { + r0 = r2 + jumpr r31 + } + /* Normal copy loops. Use dst-dst_sav to compute distance */ + /* dst holds best write, no need to unwind any loops */ + /* X - (A - B) == X + B - A */ + .falign +8189: +8199: +4189: +4199: +2189: +2199: +1189: +1199: + { + r2 += sub(dst_sav,dst) + } + { + r0 = r2 + jumpr r31 + } + + /* COPY TO USER: only stores can fail */ + .section __ex_table,"a" + .long 1100b,1109b + .long 2100b,2109b + .long 4100b,4109b + .long 8180b,8189b + .long 8190b,8199b + .long 4180b,4189b + .long 4190b,4199b + .long 2180b,2189b + .long 2190b,2199b + .long 1180b,1189b + .long 1190b,1199b + .previous diff --git a/arch/hexagon/mm/copy_user_template.S b/arch/hexagon/mm/copy_user_template.S new file mode 100644 index 000000000..254d8cc76 --- /dev/null +++ b/arch/hexagon/mm/copy_user_template.S @@ -0,0 +1,185 @@ +/* + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* Numerology: + * WXYZ + * W: width in bytes + * X: Load=0, Store=1 + * Y: Location 0=preamble,8=loop,9=epilog + * Z: Location=0,handler=9 + */ + .text + .global FUNCNAME + .type FUNCNAME, @function + .p2align 5 +FUNCNAME: + { + p0 = cmp.gtu(bytes,#0) + if (!p0.new) jump:nt .Ldone + r3 = or(dst,src) + r4 = xor(dst,src) + } + { + p1 = cmp.gtu(bytes,#15) + p0 = bitsclr(r3,#7) + if (!p0.new) jump:nt .Loop_not_aligned_8 + src_dst_sav = combine(src,dst) + } + + { + loopcount = lsr(bytes,#3) + if (!p1) jump .Lsmall + } + p3=sp1loop0(.Loop8,loopcount) +.Loop8: +8080: +8180: + { + if (p3) memd(dst++#8) = d_dbuf + d_dbuf = memd(src++#8) + }:endloop0 +8190: + { + memd(dst++#8) = d_dbuf + bytes -= asl(loopcount,#3) + jump .Lsmall + } + +.Loop_not_aligned_8: + { + p0 = bitsclr(r4,#7) + if (p0.new) jump:nt .Lalign + } + { + p0 = bitsclr(r3,#3) + if (!p0.new) jump:nt .Loop_not_aligned_4 + p1 = cmp.gtu(bytes,#7) + } + + { + if (!p1) jump .Lsmall + loopcount = lsr(bytes,#2) + } + p3=sp1loop0(.Loop4,loopcount) +.Loop4: +4080: +4180: + { + if (p3) memw(dst++#4) = w_dbuf + w_dbuf = memw(src++#4) + }:endloop0 +4190: + { + memw(dst++#4) = w_dbuf + bytes -= asl(loopcount,#2) + jump .Lsmall + } + +.Loop_not_aligned_4: + { + p0 = bitsclr(r3,#1) + if (!p0.new) jump:nt .Loop_not_aligned + p1 = cmp.gtu(bytes,#3) + } + + { + if (!p1) jump .Lsmall + loopcount = lsr(bytes,#1) + } + p3=sp1loop0(.Loop2,loopcount) +.Loop2: +2080: +2180: + { + if (p3) memh(dst++#2) = w_dbuf + w_dbuf = memuh(src++#2) + }:endloop0 +2190: + { + memh(dst++#2) = w_dbuf + bytes -= asl(loopcount,#1) + jump .Lsmall + } + +.Loop_not_aligned: /* Works for as small as one byte */ + p3=sp1loop0(.Loop1,bytes) +.Loop1: +1080: +1180: + { + if (p3) memb(dst++#1) = w_dbuf + w_dbuf = memub(src++#1) + }:endloop0 + /* Done */ +1190: + { + memb(dst) = w_dbuf + jumpr r31 + r0 = #0 + } + +.Lsmall: + { + p0 = cmp.gtu(bytes,#0) + if (p0.new) jump:nt .Loop_not_aligned + } +.Ldone: + { + r0 = #0 + jumpr r31 + } + .falign +.Lalign: +1000: + { + if (p0.new) w_dbuf = memub(src) + p0 = tstbit(src,#0) + if (!p1) jump .Lsmall + } +1100: + { + if (p0) memb(dst++#1) = w_dbuf + if (p0) bytes = add(bytes,#-1) + if (p0) src = add(src,#1) + } +2000: + { + if (p0.new) w_dbuf = memuh(src) + p0 = tstbit(src,#1) + if (!p1) jump .Lsmall + } +2100: + { + if (p0) memh(dst++#2) = w_dbuf + if (p0) bytes = add(bytes,#-2) + if (p0) src = add(src,#2) + } +4000: + { + if (p0.new) w_dbuf = memw(src) + p0 = tstbit(src,#2) + if (!p1) jump .Lsmall + } +4100: + { + if (p0) memw(dst++#4) = w_dbuf + if (p0) bytes = add(bytes,#-4) + if (p0) src = add(src,#4) + jump FUNCNAME + } + .size FUNCNAME,.-FUNCNAME diff --git a/arch/hexagon/mm/init.c b/arch/hexagon/mm/init.c new file mode 100644 index 000000000..88977e42a --- /dev/null +++ b/arch/hexagon/mm/init.c @@ -0,0 +1,283 @@ +/* + * Memory subsystem initialization for Hexagon + * + * Copyright (c) 2010-2013, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include <linux/init.h> +#include <linux/mm.h> +#include <linux/bootmem.h> +#include <asm/atomic.h> +#include <linux/highmem.h> +#include <asm/tlb.h> +#include <asm/sections.h> +#include <asm/vm_mmu.h> + +/* + * Define a startpg just past the end of the kernel image and a lastpg + * that corresponds to the end of real or simulated platform memory. + */ +#define bootmem_startpg (PFN_UP(((unsigned long) _end) - PAGE_OFFSET + PHYS_OFFSET)) + +unsigned long bootmem_lastpg; /* Should be set by platform code */ +unsigned long __phys_offset; /* physical kernel offset >> 12 */ + +/* Set as variable to limit PMD copies */ +int max_kernel_seg = 0x303; + +/* think this should be (page_size-1) the way it's used...*/ +unsigned long zero_page_mask; + +/* indicate pfn's of high memory */ +unsigned long highstart_pfn, highend_pfn; + +DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); + +/* Default cache attribute for newly created page tables */ +unsigned long _dflt_cache_att = CACHEDEF; + +/* + * The current "generation" of kernel map, which should not roll + * over until Hell freezes over. Actual bound in years needs to be + * calculated to confirm. + */ +DEFINE_SPINLOCK(kmap_gen_lock); + +/* checkpatch says don't init this to 0. */ +unsigned long long kmap_generation; + +/* + * mem_init - initializes memory + * + * Frees up bootmem + * Fixes up more stuff for HIGHMEM + * Calculates and displays memory available/used + */ +void __init mem_init(void) +{ + /* No idea where this is actually declared. Seems to evade LXR. */ + free_all_bootmem(); + mem_init_print_info(NULL); + + /* + * To-Do: someone somewhere should wipe out the bootmem map + * after we're done? + */ + + /* + * This can be moved to some more virtual-memory-specific + * initialization hook at some point. Set the init_mm + * descriptors "context" value to point to the initial + * kernel segment table's physical address. + */ + init_mm.context.ptbase = __pa(init_mm.pgd); +} + +/* + * free_initmem - frees memory used by stuff declared with __init + * + * Todo: free pages between __init_begin and __init_end; possibly + * some devtree related stuff as well. + */ +void __init_refok free_initmem(void) +{ +} + +/* + * free_initrd_mem - frees... initrd memory. + * @start - start of init memory + * @end - end of init memory + * + * Apparently has to be passed the address of the initrd memory. + * + * Wrapped by #ifdef CONFIG_BLKDEV_INITRD + */ +void free_initrd_mem(unsigned long start, unsigned long end) +{ +} + +void sync_icache_dcache(pte_t pte) +{ + unsigned long addr; + struct page *page; + + page = pte_page(pte); + addr = (unsigned long) page_address(page); + + __vmcache_idsync(addr, PAGE_SIZE); +} + +/* + * In order to set up page allocator "nodes", + * somebody has to call free_area_init() for UMA. + * + * In this mode, we only have one pg_data_t + * structure: contig_mem_data. + */ +void __init paging_init(void) +{ + unsigned long zones_sizes[MAX_NR_ZONES] = {0, }; + + /* + * This is not particularly well documented anywhere, but + * give ZONE_NORMAL all the memory, including the big holes + * left by the kernel+bootmem_map which are already left as reserved + * in the bootmem_map; free_area_init should see those bits and + * adjust accordingly. + */ + + zones_sizes[ZONE_NORMAL] = max_low_pfn; + + free_area_init(zones_sizes); /* sets up the zonelists and mem_map */ + + /* + * Start of high memory area. Will probably need something more + * fancy if we... get more fancy. + */ + high_memory = (void *)((bootmem_lastpg + 1) << PAGE_SHIFT); +} + +#ifndef DMA_RESERVE +#define DMA_RESERVE (4) +#endif + +#define DMA_CHUNKSIZE (1<<22) +#define DMA_RESERVED_BYTES (DMA_RESERVE * DMA_CHUNKSIZE) + +/* + * Pick out the memory size. We look for mem=size, + * where size is "size[KkMm]" + */ +static int __init early_mem(char *p) +{ + unsigned long size; + char *endp; + + size = memparse(p, &endp); + + bootmem_lastpg = PFN_DOWN(size); + + return 0; +} +early_param("mem", early_mem); + +size_t hexagon_coherent_pool_size = (size_t) (DMA_RESERVE << 22); + +void __init setup_arch_memory(void) +{ + int bootmap_size; + /* XXX Todo: this probably should be cleaned up */ + u32 *segtable = (u32 *) &swapper_pg_dir[0]; + u32 *segtable_end; + + /* + * Set up boot memory allocator + * + * The Gorman book also talks about these functions. + * This needs to change for highmem setups. + */ + + /* Prior to this, bootmem_lastpg is actually mem size */ + bootmem_lastpg += ARCH_PFN_OFFSET; + + /* Memory size needs to be a multiple of 16M */ + bootmem_lastpg = PFN_DOWN((bootmem_lastpg << PAGE_SHIFT) & + ~((BIG_KERNEL_PAGE_SIZE) - 1)); + + /* + * Reserve the top DMA_RESERVE bytes of RAM for DMA (uncached) + * memory allocation + */ + + max_low_pfn = bootmem_lastpg - PFN_DOWN(DMA_RESERVED_BYTES); + min_low_pfn = ARCH_PFN_OFFSET; + bootmap_size = init_bootmem_node(NODE_DATA(0), bootmem_startpg, min_low_pfn, max_low_pfn); + + printk(KERN_INFO "bootmem_startpg: 0x%08lx\n", bootmem_startpg); + printk(KERN_INFO "bootmem_lastpg: 0x%08lx\n", bootmem_lastpg); + printk(KERN_INFO "bootmap_size: %d\n", bootmap_size); + printk(KERN_INFO "min_low_pfn: 0x%08lx\n", min_low_pfn); + printk(KERN_INFO "max_low_pfn: 0x%08lx\n", max_low_pfn); + + /* + * The default VM page tables (will be) populated with + * VA=PA+PAGE_OFFSET mapping. We go in and invalidate entries + * higher than what we have memory for. + */ + + /* this is pointer arithmetic; each entry covers 4MB */ + segtable = segtable + (PAGE_OFFSET >> 22); + + /* this actually only goes to the end of the first gig */ + segtable_end = segtable + (1<<(30-22)); + + /* + * Move forward to the start of empty pages; take into account + * phys_offset shift. + */ + + segtable += (bootmem_lastpg-ARCH_PFN_OFFSET)>>(22-PAGE_SHIFT); + { + int i; + + for (i = 1 ; i <= DMA_RESERVE ; i++) + segtable[-i] = ((segtable[-i] & __HVM_PTE_PGMASK_4MB) + | __HVM_PTE_R | __HVM_PTE_W | __HVM_PTE_X + | __HEXAGON_C_UNC << 6 + | __HVM_PDE_S_4MB); + } + + printk(KERN_INFO "clearing segtable from %p to %p\n", segtable, + segtable_end); + while (segtable < (segtable_end-8)) + *(segtable++) = __HVM_PDE_S_INVALID; + /* stop the pointer at the device I/O 4MB page */ + + printk(KERN_INFO "segtable = %p (should be equal to _K_io_map)\n", + segtable); + +#if 0 + /* Other half of the early device table from vm_init_segtable. */ + printk(KERN_INFO "&_K_init_devicetable = 0x%08x\n", + (unsigned long) _K_init_devicetable-PAGE_OFFSET); + *segtable = ((u32) (unsigned long) _K_init_devicetable-PAGE_OFFSET) | + __HVM_PDE_S_4KB; + printk(KERN_INFO "*segtable = 0x%08x\n", *segtable); +#endif + + /* + * Free all the memory that wasn't taken up by the bootmap, the DMA + * reserve, or kernel itself. + */ + free_bootmem(PFN_PHYS(bootmem_startpg) + bootmap_size, + PFN_PHYS(bootmem_lastpg - bootmem_startpg) - bootmap_size - + DMA_RESERVED_BYTES); + + /* + * The bootmem allocator seemingly just lives to feed memory + * to the paging system + */ + printk(KERN_INFO "PAGE_SIZE=%lu\n", PAGE_SIZE); + paging_init(); /* See Gorman Book, 2.3 */ + + /* + * At this point, the page allocator is kind of initialized, but + * apparently no pages are available (just like with the bootmem + * allocator), and need to be freed themselves via mem_init(), + * which is called by start_kernel() later on in the process + */ +} diff --git a/arch/hexagon/mm/ioremap.c b/arch/hexagon/mm/ioremap.c new file mode 100644 index 000000000..d27d67224 --- /dev/null +++ b/arch/hexagon/mm/ioremap.c @@ -0,0 +1,57 @@ +/* + * I/O remap functions for Hexagon + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include <linux/io.h> +#include <linux/vmalloc.h> +#include <linux/mm.h> + +void __iomem *ioremap_nocache(unsigned long phys_addr, unsigned long size) +{ + unsigned long last_addr, addr; + unsigned long offset = phys_addr & ~PAGE_MASK; + struct vm_struct *area; + + pgprot_t prot = __pgprot(_PAGE_PRESENT|_PAGE_READ|_PAGE_WRITE + |(__HEXAGON_C_DEV << 6)); + + last_addr = phys_addr + size - 1; + + /* Wrapping not allowed */ + if (!size || (last_addr < phys_addr)) + return NULL; + + /* Rounds up to next page size, including whole-page offset */ + size = PAGE_ALIGN(offset + size); + + area = get_vm_area(size, VM_IOREMAP); + addr = (unsigned long)area->addr; + + if (ioremap_page_range(addr, addr+size, phys_addr, prot)) { + vunmap((void *)addr); + return NULL; + } + + return (void __iomem *) (offset + addr); +} + +void __iounmap(const volatile void __iomem *addr) +{ + vunmap((void *) ((unsigned long) addr & PAGE_MASK)); +} diff --git a/arch/hexagon/mm/pgalloc.c b/arch/hexagon/mm/pgalloc.c new file mode 100644 index 000000000..19760a461 --- /dev/null +++ b/arch/hexagon/mm/pgalloc.c @@ -0,0 +1,23 @@ +/* + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#include <linux/init.h> + +void __init pgtable_cache_init(void) +{ +} diff --git a/arch/hexagon/mm/strnlen_user.S b/arch/hexagon/mm/strnlen_user.S new file mode 100644 index 000000000..0eecb7a76 --- /dev/null +++ b/arch/hexagon/mm/strnlen_user.S @@ -0,0 +1,139 @@ +/* + * User string length functions for kernel + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +#define isrc r0 +#define max r1 /* Do not change! */ + +#define end r2 +#define tmp1 r3 + +#define obo r6 /* off-by-one */ +#define start r7 +#define mod8 r8 +#define dbuf r15:14 +#define dcmp r13:12 + +/* + * The vector mask version of this turned out *really* badly. + * The hardware loop version also turned out *really* badly. + * Seems straight pointer arithmetic basically wins here. + */ + +#define fname __strnlen_user + + .text + .global fname + .type fname, @function + .p2align 5 /* why? */ +fname: + { + mod8 = and(isrc,#7); + end = add(isrc,max); + start = isrc; + } + { + P0 = cmp.eq(mod8,#0); + mod8 = and(end,#7); + dcmp = #0; + if (P0.new) jump:t dw_loop; /* fire up the oven */ + } + +alignment_loop: +fail_1: { + tmp1 = memb(start++#1); + } + { + P0 = cmp.eq(tmp1,#0); + if (P0.new) jump:nt exit_found; + P1 = cmp.gtu(end,start); + mod8 = and(start,#7); + } + { + if (!P1) jump exit_error; /* hit the end */ + P0 = cmp.eq(mod8,#0); + } + { + if (!P0) jump alignment_loop; + } + + + +dw_loop: +fail_2: { + dbuf = memd(start); + obo = add(start,#1); + } + { + P0 = vcmpb.eq(dbuf,dcmp); + } + { + tmp1 = P0; + P0 = cmp.gtu(end,start); + } + { + tmp1 = ct0(tmp1); + mod8 = and(end,#7); + if (!P0) jump end_check; + } + { + P0 = cmp.eq(tmp1,#32); + if (!P0.new) jump:nt exit_found; + if (!P0.new) start = add(obo,tmp1); + } + { + start = add(start,#8); + jump dw_loop; + } /* might be nice to combine these jumps... */ + + +end_check: + { + P0 = cmp.gt(tmp1,mod8); + if (P0.new) jump:nt exit_error; /* neverfound! */ + start = add(obo,tmp1); + } + +exit_found: + { + R0 = sub(start,isrc); + jumpr R31; + } + +exit_error: + { + R0 = add(max,#1); + jumpr R31; + } + + /* Uh, what does the "fixup" return here? */ + .falign +fix_1: + { + R0 = #0; + jumpr R31; + } + + .size fname,.-fname + + +.section __ex_table,"a" +.long fail_1,fix_1 +.long fail_2,fix_1 +.previous diff --git a/arch/hexagon/mm/uaccess.c b/arch/hexagon/mm/uaccess.c new file mode 100644 index 000000000..34127261c --- /dev/null +++ b/arch/hexagon/mm/uaccess.c @@ -0,0 +1,59 @@ +/* + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* + * Support for user memory access from kernel. This will + * probably be inlined for performance at some point, but + * for ease of debug, and to a lesser degree for code size, + * we implement here as subroutines. + */ +#include <linux/types.h> +#include <asm/uaccess.h> +#include <asm/pgtable.h> + +/* + * For clear_user(), exploit previously defined copy_to_user function + * and the fact that we've got a handy zero page defined in kernel/head.S + * + * dczero here would be even faster. + */ +__kernel_size_t __clear_user_hexagon(void __user *dest, unsigned long count) +{ + long uncleared; + + while (count > PAGE_SIZE) { + uncleared = __copy_to_user_hexagon(dest, &empty_zero_page, + PAGE_SIZE); + if (uncleared) + return count - (PAGE_SIZE - uncleared); + count -= PAGE_SIZE; + dest += PAGE_SIZE; + } + if (count) + count = __copy_to_user_hexagon(dest, &empty_zero_page, count); + + return count; +} + +unsigned long clear_user_hexagon(void __user *dest, unsigned long count) +{ + if (!access_ok(VERIFY_WRITE, dest, count)) + return count; + else + return __clear_user_hexagon(dest, count); +} diff --git a/arch/hexagon/mm/vm_fault.c b/arch/hexagon/mm/vm_fault.c new file mode 100644 index 000000000..8704c9320 --- /dev/null +++ b/arch/hexagon/mm/vm_fault.c @@ -0,0 +1,202 @@ +/* + * Memory fault handling for Hexagon + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* + * Page fault handling for the Hexagon Virtual Machine. + * Can also be called by a native port emulating the HVM + * execptions. + */ + +#include <asm/pgtable.h> +#include <asm/traps.h> +#include <asm/uaccess.h> +#include <linux/mm.h> +#include <linux/signal.h> +#include <linux/module.h> +#include <linux/hardirq.h> + +/* + * Decode of hardware exception sends us to one of several + * entry points. At each, we generate canonical arguments + * for handling by the abstract memory management code. + */ +#define FLT_IFETCH -1 +#define FLT_LOAD 0 +#define FLT_STORE 1 + + +/* + * Canonical page fault handler + */ +void do_page_fault(unsigned long address, long cause, struct pt_regs *regs) +{ + struct vm_area_struct *vma; + struct mm_struct *mm = current->mm; + siginfo_t info; + int si_code = SEGV_MAPERR; + int fault; + const struct exception_table_entry *fixup; + unsigned int flags = FAULT_FLAG_ALLOW_RETRY | FAULT_FLAG_KILLABLE; + + /* + * If we're in an interrupt or have no user context, + * then must not take the fault. + */ + if (unlikely(in_interrupt() || !mm)) + goto no_context; + + local_irq_enable(); + + if (user_mode(regs)) + flags |= FAULT_FLAG_USER; +retry: + down_read(&mm->mmap_sem); + vma = find_vma(mm, address); + if (!vma) + goto bad_area; + + if (vma->vm_start <= address) + goto good_area; + + if (!(vma->vm_flags & VM_GROWSDOWN)) + goto bad_area; + + if (expand_stack(vma, address)) + goto bad_area; + +good_area: + /* Address space is OK. Now check access rights. */ + si_code = SEGV_ACCERR; + + switch (cause) { + case FLT_IFETCH: + if (!(vma->vm_flags & VM_EXEC)) + goto bad_area; + break; + case FLT_LOAD: + if (!(vma->vm_flags & VM_READ)) + goto bad_area; + break; + case FLT_STORE: + if (!(vma->vm_flags & VM_WRITE)) + goto bad_area; + flags |= FAULT_FLAG_WRITE; + break; + } + + fault = handle_mm_fault(mm, vma, address, flags); + + if ((fault & VM_FAULT_RETRY) && fatal_signal_pending(current)) + return; + + /* The most common case -- we are done. */ + if (likely(!(fault & VM_FAULT_ERROR))) { + if (flags & FAULT_FLAG_ALLOW_RETRY) { + if (fault & VM_FAULT_MAJOR) + current->maj_flt++; + else + current->min_flt++; + if (fault & VM_FAULT_RETRY) { + flags &= ~FAULT_FLAG_ALLOW_RETRY; + flags |= FAULT_FLAG_TRIED; + goto retry; + } + } + + up_read(&mm->mmap_sem); + return; + } + + up_read(&mm->mmap_sem); + + /* Handle copyin/out exception cases */ + if (!user_mode(regs)) + goto no_context; + + if (fault & VM_FAULT_OOM) { + pagefault_out_of_memory(); + return; + } + + /* User-mode address is in the memory map, but we are + * unable to fix up the page fault. + */ + if (fault & VM_FAULT_SIGBUS) { + info.si_signo = SIGBUS; + info.si_code = BUS_ADRERR; + } + /* Address is not in the memory map */ + else { + info.si_signo = SIGSEGV; + info.si_code = SEGV_ACCERR; + } + info.si_errno = 0; + info.si_addr = (void __user *)address; + force_sig_info(info.si_signo, &info, current); + return; + +bad_area: + up_read(&mm->mmap_sem); + + if (user_mode(regs)) { + info.si_signo = SIGSEGV; + info.si_errno = 0; + info.si_code = si_code; + info.si_addr = (void *)address; + force_sig_info(info.si_signo, &info, current); + return; + } + /* Kernel-mode fault falls through */ + +no_context: + fixup = search_exception_tables(pt_elr(regs)); + if (fixup) { + pt_set_elr(regs, fixup->fixup); + return; + } + + /* Things are looking very, very bad now */ + bust_spinlocks(1); + printk(KERN_EMERG "Unable to handle kernel paging request at " + "virtual address 0x%08lx, regs %p\n", address, regs); + die("Bad Kernel VA", regs, SIGKILL); +} + + +void read_protection_fault(struct pt_regs *regs) +{ + unsigned long badvadr = pt_badva(regs); + + do_page_fault(badvadr, FLT_LOAD, regs); +} + +void write_protection_fault(struct pt_regs *regs) +{ + unsigned long badvadr = pt_badva(regs); + + do_page_fault(badvadr, FLT_STORE, regs); +} + +void execute_protection_fault(struct pt_regs *regs) +{ + unsigned long badvadr = pt_badva(regs); + + do_page_fault(badvadr, FLT_IFETCH, regs); +} diff --git a/arch/hexagon/mm/vm_tlb.c b/arch/hexagon/mm/vm_tlb.c new file mode 100644 index 000000000..9647d00cb --- /dev/null +++ b/arch/hexagon/mm/vm_tlb.c @@ -0,0 +1,93 @@ +/* + * Hexagon Virtual Machine TLB functions + * + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* + * The Hexagon Virtual Machine conceals the real workings of + * the TLB, but there are one or two functions that need to + * be instantiated for it, differently from a native build. + */ +#include <linux/mm.h> +#include <asm/page.h> +#include <asm/hexagon_vm.h> + +/* + * Initial VM implementation has only one map active at a time, with + * TLB purgings on changes. So either we're nuking the current map, + * or it's a no-op. This operation is messy on true SMPs where other + * processors must be induced to flush the copies in their local TLBs, + * but Hexagon thread-based virtual processors share the same MMU. + */ +void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, + unsigned long end) +{ + struct mm_struct *mm = vma->vm_mm; + + if (mm->context.ptbase == current->active_mm->context.ptbase) + __vmclrmap((void *)start, end - start); +} + +/* + * Flush a page from the kernel virtual map - used by highmem + */ +void flush_tlb_one(unsigned long vaddr) +{ + __vmclrmap((void *)vaddr, PAGE_SIZE); +} + +/* + * Flush all TLBs across all CPUs, virtual or real. + * A single Hexagon core has 6 thread contexts but + * only one TLB. + */ +void tlb_flush_all(void) +{ + /* should probably use that fixaddr end or whateve label */ + __vmclrmap(0, 0xffff0000); +} + +/* + * Flush TLB entries associated with a given mm_struct mapping. + */ +void flush_tlb_mm(struct mm_struct *mm) +{ + /* Current Virtual Machine has only one map active at a time */ + if (current->active_mm->context.ptbase == mm->context.ptbase) + tlb_flush_all(); +} + +/* + * Flush TLB state associated with a page of a vma. + */ +void flush_tlb_page(struct vm_area_struct *vma, unsigned long vaddr) +{ + struct mm_struct *mm = vma->vm_mm; + + if (mm->context.ptbase == current->active_mm->context.ptbase) + __vmclrmap((void *)vaddr, PAGE_SIZE); +} + +/* + * Flush TLB entries associated with a kernel address range. + * Like flush range, but without the check on the vma->vm_mm. + */ +void flush_tlb_kernel_range(unsigned long start, unsigned long end) +{ + __vmclrmap((void *)start, end - start); +} |