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Diffstat (limited to 'arch/ppc64/mm/hash_low.S')
| -rw-r--r-- | arch/ppc64/mm/hash_low.S | 288 |
1 files changed, 0 insertions, 288 deletions
diff --git a/arch/ppc64/mm/hash_low.S b/arch/ppc64/mm/hash_low.S deleted file mode 100644 index ee5a5d36bfa..00000000000 --- a/arch/ppc64/mm/hash_low.S +++ /dev/null @@ -1,288 +0,0 @@ -/* - * ppc64 MMU hashtable management routines - * - * (c) Copyright IBM Corp. 2003 - * - * Maintained by: Benjamin Herrenschmidt - * <benh@kernel.crashing.org> - * - * This file is covered by the GNU Public Licence v2 as - * described in the kernel's COPYING file. - */ - -#include <asm/processor.h> -#include <asm/pgtable.h> -#include <asm/mmu.h> -#include <asm/page.h> -#include <asm/types.h> -#include <asm/ppc_asm.h> -#include <asm/asm-offsets.h> -#include <asm/cputable.h> - - .text - -/* - * Stackframe: - * - * +-> Back chain (SP + 256) - * | General register save area (SP + 112) - * | Parameter save area (SP + 48) - * | TOC save area (SP + 40) - * | link editor doubleword (SP + 32) - * | compiler doubleword (SP + 24) - * | LR save area (SP + 16) - * | CR save area (SP + 8) - * SP ---> +-- Back chain (SP + 0) - */ -#define STACKFRAMESIZE 256 - -/* Save parameters offsets */ -#define STK_PARM(i) (STACKFRAMESIZE + 48 + ((i)-3)*8) - -/* Save non-volatile offsets */ -#define STK_REG(i) (112 + ((i)-14)*8) - -/* - * _hash_page(unsigned long ea, unsigned long access, unsigned long vsid, - * pte_t *ptep, unsigned long trap, int local) - * - * Adds a page to the hash table. This is the non-LPAR version for now - */ - -_GLOBAL(__hash_page) - mflr r0 - std r0,16(r1) - stdu r1,-STACKFRAMESIZE(r1) - /* Save all params that we need after a function call */ - std r6,STK_PARM(r6)(r1) - std r8,STK_PARM(r8)(r1) - - /* Add _PAGE_PRESENT to access */ - ori r4,r4,_PAGE_PRESENT - - /* Save non-volatile registers. - * r31 will hold "old PTE" - * r30 is "new PTE" - * r29 is "va" - * r28 is a hash value - * r27 is hashtab mask (maybe dynamic patched instead ?) - */ - std r27,STK_REG(r27)(r1) - std r28,STK_REG(r28)(r1) - std r29,STK_REG(r29)(r1) - std r30,STK_REG(r30)(r1) - std r31,STK_REG(r31)(r1) - - /* Step 1: - * - * Check permissions, atomically mark the linux PTE busy - * and hashed. - */ -1: - ldarx r31,0,r6 - /* Check access rights (access & ~(pte_val(*ptep))) */ - andc. r0,r4,r31 - bne- htab_wrong_access - /* Check if PTE is busy */ - andi. r0,r31,_PAGE_BUSY - /* If so, just bail out and refault if needed. Someone else - * is changing this PTE anyway and might hash it. - */ - bne- bail_ok - /* Prepare new PTE value (turn access RW into DIRTY, then - * add BUSY,HASHPTE and ACCESSED) - */ - rlwinm r30,r4,32-9+7,31-7,31-7 /* _PAGE_RW -> _PAGE_DIRTY */ - or r30,r30,r31 - ori r30,r30,_PAGE_BUSY | _PAGE_ACCESSED | _PAGE_HASHPTE - /* Write the linux PTE atomically (setting busy) */ - stdcx. r30,0,r6 - bne- 1b - isync - - /* Step 2: - * - * Insert/Update the HPTE in the hash table. At this point, - * r4 (access) is re-useable, we use it for the new HPTE flags - */ - - /* Calc va and put it in r29 */ - rldicr r29,r5,28,63-28 - rldicl r3,r3,0,36 - or r29,r3,r29 - - /* Calculate hash value for primary slot and store it in r28 */ - rldicl r5,r5,0,25 /* vsid & 0x0000007fffffffff */ - rldicl r0,r3,64-12,48 /* (ea >> 12) & 0xffff */ - xor r28,r5,r0 - - /* Convert linux PTE bits into HW equivalents */ - andi. r3,r30,0x1fe /* Get basic set of flags */ - xori r3,r3,HW_NO_EXEC /* _PAGE_EXEC -> NOEXEC */ - rlwinm r0,r30,32-9+1,30,30 /* _PAGE_RW -> _PAGE_USER (r0) */ - rlwinm r4,r30,32-7+1,30,30 /* _PAGE_DIRTY -> _PAGE_USER (r4) */ - and r0,r0,r4 /* _PAGE_RW & _PAGE_DIRTY -> r0 bit 30 */ - andc r0,r30,r0 /* r0 = pte & ~r0 */ - rlwimi r3,r0,32-1,31,31 /* Insert result into PP lsb */ - - /* We eventually do the icache sync here (maybe inline that - * code rather than call a C function...) - */ -BEGIN_FTR_SECTION - mr r4,r30 - mr r5,r7 - bl .hash_page_do_lazy_icache -END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE) - - /* At this point, r3 contains new PP bits, save them in - * place of "access" in the param area (sic) - */ - std r3,STK_PARM(r4)(r1) - - /* Get htab_hash_mask */ - ld r4,htab_hash_mask@got(2) - ld r27,0(r4) /* htab_hash_mask -> r27 */ - - /* Check if we may already be in the hashtable, in this case, we - * go to out-of-line code to try to modify the HPTE - */ - andi. r0,r31,_PAGE_HASHPTE - bne htab_modify_pte - -htab_insert_pte: - /* Clear hpte bits in new pte (we also clear BUSY btw) and - * add _PAGE_HASHPTE - */ - lis r0,_PAGE_HPTEFLAGS@h - ori r0,r0,_PAGE_HPTEFLAGS@l - andc r30,r30,r0 - ori r30,r30,_PAGE_HASHPTE - - /* page number in r5 */ - rldicl r5,r31,64-PTE_SHIFT,PTE_SHIFT - - /* Calculate primary group hash */ - and r0,r28,r27 - rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */ - - /* Call ppc_md.hpte_insert */ - ld r7,STK_PARM(r4)(r1) /* Retreive new pp bits */ - mr r4,r29 /* Retreive va */ - li r6,0 /* no vflags */ -_GLOBAL(htab_call_hpte_insert1) - bl . /* Will be patched by htab_finish_init() */ - cmpdi 0,r3,0 - bge htab_pte_insert_ok /* Insertion successful */ - cmpdi 0,r3,-2 /* Critical failure */ - beq- htab_pte_insert_failure - - /* Now try secondary slot */ - - /* page number in r5 */ - rldicl r5,r31,64-PTE_SHIFT,PTE_SHIFT - - /* Calculate secondary group hash */ - andc r0,r27,r28 - rldicr r3,r0,3,63-3 /* r0 = (~hash & mask) << 3 */ - - /* Call ppc_md.hpte_insert */ - ld r7,STK_PARM(r4)(r1) /* Retreive new pp bits */ - mr r4,r29 /* Retreive va */ - li r6,HPTE_V_SECONDARY@l /* secondary slot */ -_GLOBAL(htab_call_hpte_insert2) - bl . /* Will be patched by htab_finish_init() */ - cmpdi 0,r3,0 - bge+ htab_pte_insert_ok /* Insertion successful */ - cmpdi 0,r3,-2 /* Critical failure */ - beq- htab_pte_insert_failure - - /* Both are full, we need to evict something */ - mftb r0 - /* Pick a random group based on TB */ - andi. r0,r0,1 - mr r5,r28 - bne 2f - not r5,r5 -2: and r0,r5,r27 - rldicr r3,r0,3,63-3 /* r0 = (hash & mask) << 3 */ - /* Call ppc_md.hpte_remove */ -_GLOBAL(htab_call_hpte_remove) - bl . /* Will be patched by htab_finish_init() */ - - /* Try all again */ - b htab_insert_pte - -bail_ok: - li r3,0 - b bail - -htab_pte_insert_ok: - /* Insert slot number & secondary bit in PTE */ - rldimi r30,r3,12,63-15 - - /* Write out the PTE with a normal write - * (maybe add eieio may be good still ?) - */ -htab_write_out_pte: - ld r6,STK_PARM(r6)(r1) - std r30,0(r6) - li r3, 0 -bail: - ld r27,STK_REG(r27)(r1) - ld r28,STK_REG(r28)(r1) - ld r29,STK_REG(r29)(r1) - ld r30,STK_REG(r30)(r1) - ld r31,STK_REG(r31)(r1) - addi r1,r1,STACKFRAMESIZE - ld r0,16(r1) - mtlr r0 - blr - -htab_modify_pte: - /* Keep PP bits in r4 and slot idx from the PTE around in r3 */ - mr r4,r3 - rlwinm r3,r31,32-12,29,31 - - /* Secondary group ? if yes, get a inverted hash value */ - mr r5,r28 - andi. r0,r31,_PAGE_SECONDARY - beq 1f - not r5,r5 -1: - /* Calculate proper slot value for ppc_md.hpte_updatepp */ - and r0,r5,r27 - rldicr r0,r0,3,63-3 /* r0 = (hash & mask) << 3 */ - add r3,r0,r3 /* add slot idx */ - - /* Call ppc_md.hpte_updatepp */ - mr r5,r29 /* va */ - li r6,0 /* large is 0 */ - ld r7,STK_PARM(r8)(r1) /* get "local" param */ -_GLOBAL(htab_call_hpte_updatepp) - bl . /* Will be patched by htab_finish_init() */ - - /* if we failed because typically the HPTE wasn't really here - * we try an insertion. - */ - cmpdi 0,r3,-1 - beq- htab_insert_pte - - /* Clear the BUSY bit and Write out the PTE */ - li r0,_PAGE_BUSY - andc r30,r30,r0 - b htab_write_out_pte - -htab_wrong_access: - /* Bail out clearing reservation */ - stdcx. r31,0,r6 - li r3,1 - b bail - -htab_pte_insert_failure: - /* Bail out restoring old PTE */ - ld r6,STK_PARM(r6)(r1) - std r31,0(r6) - li r3,-1 - b bail - - |