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| author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-01-20 14:01:31 -0300 |
|---|---|---|
| committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-01-20 14:01:31 -0300 |
| commit | b4b7ff4b08e691656c9d77c758fc355833128ac0 (patch) | |
| tree | 82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /arch/powerpc/kernel/misc_64.S | |
| parent | 35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff) | |
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'arch/powerpc/kernel/misc_64.S')
| -rw-r--r-- | arch/powerpc/kernel/misc_64.S | 60 |
1 files changed, 59 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/misc_64.S b/arch/powerpc/kernel/misc_64.S index 6e4168cf4..db475d41b 100644 --- a/arch/powerpc/kernel/misc_64.S +++ b/arch/powerpc/kernel/misc_64.S @@ -26,6 +26,7 @@ #include <asm/thread_info.h> #include <asm/kexec.h> #include <asm/ptrace.h> +#include <asm/mmu.h> .text @@ -484,6 +485,8 @@ _GLOBAL(kexec_wait) mtsrr1 r11 rfid #else + /* Create TLB entry in book3e_secondary_core_init */ + li r4,0 ba 0x60 #endif #endif @@ -496,6 +499,51 @@ kexec_flag: #ifdef CONFIG_KEXEC +#ifdef CONFIG_PPC_BOOK3E +/* + * BOOK3E has no real MMU mode, so we have to setup the initial TLB + * for a core to identity map v:0 to p:0. This current implementation + * assumes that 1G is enough for kexec. + */ +kexec_create_tlb: + /* + * Invalidate all non-IPROT TLB entries to avoid any TLB conflict. + * IPROT TLB entries should be >= PAGE_OFFSET and thus not conflict. + */ + PPC_TLBILX_ALL(0,R0) + sync + isync + + mfspr r10,SPRN_TLB1CFG + andi. r10,r10,TLBnCFG_N_ENTRY /* Extract # entries */ + subi r10,r10,1 /* Last entry: no conflict with kernel text */ + lis r9,MAS0_TLBSEL(1)@h + rlwimi r9,r10,16,4,15 /* Setup MAS0 = TLBSEL | ESEL(r9) */ + +/* Set up a temp identity mapping v:0 to p:0 and return to it. */ +#if defined(CONFIG_SMP) || defined(CONFIG_PPC_E500MC) +#define M_IF_NEEDED MAS2_M +#else +#define M_IF_NEEDED 0 +#endif + mtspr SPRN_MAS0,r9 + + lis r9,(MAS1_VALID|MAS1_IPROT)@h + ori r9,r9,(MAS1_TSIZE(BOOK3E_PAGESZ_1GB))@l + mtspr SPRN_MAS1,r9 + + LOAD_REG_IMMEDIATE(r9, 0x0 | M_IF_NEEDED) + mtspr SPRN_MAS2,r9 + + LOAD_REG_IMMEDIATE(r9, 0x0 | MAS3_SR | MAS3_SW | MAS3_SX) + mtspr SPRN_MAS3,r9 + li r9,0 + mtspr SPRN_MAS7,r9 + + tlbwe + isync + blr +#endif /* kexec_smp_wait(void) * @@ -525,6 +573,10 @@ _GLOBAL(kexec_smp_wait) * don't overwrite r3 here, it is live for kexec_wait above. */ real_mode: /* assume normal blr return */ +#ifdef CONFIG_PPC_BOOK3E + /* Create an identity mapping. */ + b kexec_create_tlb +#else 1: li r9,MSR_RI li r10,MSR_DR|MSR_IR mflr r11 /* return address to SRR0 */ @@ -536,7 +588,7 @@ real_mode: /* assume normal blr return */ mtspr SPRN_SRR1,r10 mtspr SPRN_SRR0,r11 rfid - +#endif /* * kexec_sequence(newstack, start, image, control, clear_all()) @@ -579,9 +631,13 @@ _GLOBAL(kexec_sequence) lhz r25,PACAHWCPUID(r13) /* get our phys cpu from paca */ /* disable interrupts, we are overwriting kernel data next */ +#ifdef CONFIG_PPC_BOOK3E + wrteei 0 +#else mfmsr r3 rlwinm r3,r3,0,17,15 mtmsrd r3,1 +#endif /* copy dest pages, flush whole dest image */ mr r3,r29 @@ -603,6 +659,7 @@ _GLOBAL(kexec_sequence) li r6,1 stw r6,kexec_flag-1b(5) +#ifndef CONFIG_PPC_BOOK3E /* clear out hardware hash page table and tlb */ #if !defined(_CALL_ELF) || _CALL_ELF != 2 ld r12,0(r27) /* deref function descriptor */ @@ -611,6 +668,7 @@ _GLOBAL(kexec_sequence) #endif mtctr r12 bctrl /* ppc_md.hpte_clear_all(void); */ +#endif /* !CONFIG_PPC_BOOK3E */ /* * kexec image calling is: |