diff options
Diffstat (limited to 'arch/powerpc/mm')
| -rw-r--r-- | arch/powerpc/mm/hash_low_32.S | 22 | ||||
| -rw-r--r-- | arch/powerpc/mm/mem.c | 3 | ||||
| -rw-r--r-- | arch/powerpc/mm/mmu_decl.h | 4 | ||||
| -rw-r--r-- | arch/powerpc/mm/pgtable_32.c | 11 |
4 files changed, 31 insertions, 9 deletions
diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S index bd68df5fa78..ddceefc06ec 100644 --- a/arch/powerpc/mm/hash_low_32.S +++ b/arch/powerpc/mm/hash_low_32.S @@ -283,6 +283,7 @@ Hash_msk = (((1 << Hash_bits) - 1) * 64) #define PTEG_SIZE 64 #define LG_PTEG_SIZE 6 #define LDPTEu lwzu +#define LDPTE lwz #define STPTE stw #define CMPPTE cmpw #define PTE_H 0x40 @@ -389,13 +390,30 @@ _GLOBAL(hash_page_patch_C) * and we know there is a definite (although small) speed * advantage to putting the PTE in the primary PTEG, we always * put the PTE in the primary PTEG. + * + * In addition, we skip any slot that is mapping kernel text in + * order to avoid a deadlock when not using BAT mappings if + * trying to hash in the kernel hash code itself after it has + * already taken the hash table lock. This works in conjunction + * with pre-faulting of the kernel text. + * + * If the hash table bucket is full of kernel text entries, we'll + * lockup here but that shouldn't happen */ - addis r4,r7,next_slot@ha + +1: addis r4,r7,next_slot@ha /* get next evict slot */ lwz r6,next_slot@l(r4) - addi r6,r6,PTE_SIZE + addi r6,r6,PTE_SIZE /* search for candidate */ andi. r6,r6,7*PTE_SIZE stw r6,next_slot@l(r4) add r4,r3,r6 + LDPTE r0,PTE_SIZE/2(r4) /* get PTE second word */ + clrrwi r0,r0,12 + lis r6,etext@h + ori r6,r6,etext@l /* get etext */ + tophys(r6,r6) + cmpl cr0,r0,r6 /* compare and try again */ + blt 1b #ifndef CONFIG_SMP /* Store PTE in PTEG */ diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index 52f397c108a..c4bcd754642 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -58,9 +58,6 @@ int init_bootmem_done; int mem_init_done; unsigned long memory_limit; -extern void hash_preload(struct mm_struct *mm, unsigned long ea, - unsigned long access, unsigned long trap); - int page_is_ram(unsigned long pfn) { unsigned long paddr = (pfn << PAGE_SHIFT); diff --git a/arch/powerpc/mm/mmu_decl.h b/arch/powerpc/mm/mmu_decl.h index bea2d21ac6f..ee55e0bb28b 100644 --- a/arch/powerpc/mm/mmu_decl.h +++ b/arch/powerpc/mm/mmu_decl.h @@ -22,6 +22,10 @@ #include <asm/tlbflush.h> #include <asm/mmu.h> +extern void hash_preload(struct mm_struct *mm, unsigned long ea, + unsigned long access, unsigned long trap); + + #ifdef CONFIG_PPC32 extern void mapin_ram(void); extern int map_page(unsigned long va, phys_addr_t pa, int flags); diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c index 95d3afe36b5..f75f2fc7bc7 100644 --- a/arch/powerpc/mm/pgtable_32.c +++ b/arch/powerpc/mm/pgtable_32.c @@ -282,16 +282,19 @@ int map_page(unsigned long va, phys_addr_t pa, int flags) void __init mapin_ram(void) { unsigned long v, p, s, f; + int ktext; s = mmu_mapin_ram(); v = KERNELBASE + s; p = PPC_MEMSTART + s; for (; s < total_lowmem; s += PAGE_SIZE) { - if ((char *) v >= _stext && (char *) v < etext) - f = _PAGE_RAM_TEXT; - else - f = _PAGE_RAM; + ktext = ((char *) v >= _stext && (char *) v < etext); + f = ktext ?_PAGE_RAM_TEXT : _PAGE_RAM; map_page(v, p, f); +#ifdef CONFIG_PPC_STD_MMU_32 + if (ktext) + hash_preload(&init_mm, v, 0, 0x300); +#endif v += PAGE_SIZE; p += PAGE_SIZE; } |