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authorAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>2015-12-01 09:06:49 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2015-12-14 15:19:12 +1100
commita43c0eb8364c022725df586e91dd753633374d66 (patch)
tree3615f416ee6ab584340c89691689f58f35fc1694 /arch/powerpc/mm/hash_low_64.S
parent89ff725051d177556b23d80f2a30f880a657a6c1 (diff)
powerpc/mm: Convert 4k insert from asm to C
This is similar to 64K insert. May be we want to consolidate Acked-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hash_low_64.S')
-rw-r--r--arch/powerpc/mm/hash_low_64.S331
1 files changed, 0 insertions, 331 deletions
diff --git a/arch/powerpc/mm/hash_low_64.S b/arch/powerpc/mm/hash_low_64.S
deleted file mode 100644
index f7d49cf0ccb7..000000000000
--- a/arch/powerpc/mm/hash_low_64.S
+++ /dev/null
@@ -1,331 +0,0 @@
-/*
- * ppc64 MMU hashtable management routines
- *
- * (c) Copyright IBM Corp. 2003, 2005
- *
- * 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/reg.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)
- */
-
-#ifndef CONFIG_PPC_64K_PAGES
-
-/*****************************************************************************
- * *
- * 4K SW & 4K HW pages implementation *
- * *
- *****************************************************************************/
-
-
-/*
- * _hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
- * pte_t *ptep, unsigned long trap, unsigned long flags,
- * int ssize)
- *
- * Adds a 4K page to the hash table in a segment of 4K pages only
- */
-
-_GLOBAL(__hash_page_4K)
- mflr r0
- std r0,16(r1)
- stdu r1,-STACKFRAMESIZE(r1)
- /* Save all params that we need after a function call */
- std r6,STK_PARAM(R6)(r1)
- std r8,STK_PARAM(R8)(r1)
- std r9,STK_PARAM(R9)(r1)
-
- /* Save non-volatile registers.
- * r31 will hold "old PTE"
- * r30 is "new PTE"
- * r29 is vpn
- * 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- htab_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
- */
-
-BEGIN_FTR_SECTION
- cmpdi r9,0 /* check segment size */
- bne 3f
-END_MMU_FTR_SECTION_IFSET(MMU_FTR_1T_SEGMENT)
- /* Calc vpn and put it in r29 */
- sldi r29,r5,SID_SHIFT - VPN_SHIFT
- rldicl r28,r3,64 - VPN_SHIFT,64 - (SID_SHIFT - VPN_SHIFT)
- or r29,r28,r29
- /*
- * Calculate hash value for primary slot and store it in r28
- * r3 = va, r5 = vsid
- * r0 = (va >> 12) & ((1ul << (28 - 12)) -1)
- */
- rldicl r0,r3,64-12,48
- xor r28,r5,r0 /* hash */
- b 4f
-
-3: /* Calc vpn and put it in r29 */
- sldi r29,r5,SID_SHIFT_1T - VPN_SHIFT
- rldicl r28,r3,64 - VPN_SHIFT,64 - (SID_SHIFT_1T - VPN_SHIFT)
- or r29,r28,r29
-
- /*
- * calculate hash value for primary slot and
- * store it in r28 for 1T segment
- * r3 = va, r5 = vsid
- */
- sldi r28,r5,25 /* vsid << 25 */
- /* r0 = (va >> 12) & ((1ul << (40 - 12)) -1) */
- rldicl r0,r3,64-12,36
- xor r28,r28,r5 /* vsid ^ ( vsid << 25) */
- xor r28,r28,r0 /* hash */
-
- /* Convert linux PTE bits into HW equivalents */
-4: andi. r3,r30,0x1fe /* Get basic set of flags */
- xori r3,r3,HPTE_R_N /* _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 */
- /*
- * Always add "C" bit for perf. Memory coherence is always enabled
- */
- ori r3,r3,HPTE_R_C | HPTE_R_M
-
- /* 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_PARAM(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
-
- /* physical address r5 */
- rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
- sldi r5,r5,PAGE_SHIFT
-
- /* Calculate primary group hash */
- and r0,r28,r27
- rldicr r3,r0,3,63-3 /* r3 = (hash & mask) << 3 */
-
- /* Call ppc_md.hpte_insert */
- ld r6,STK_PARAM(R4)(r1) /* Retrieve new pp bits */
- mr r4,r29 /* Retrieve vpn */
- li r7,0 /* !bolted, !secondary */
- li r8,MMU_PAGE_4K /* page size */
- li r9,MMU_PAGE_4K /* actual page size */
- ld r10,STK_PARAM(R9)(r1) /* segment size */
-.globl htab_call_hpte_insert1
-htab_call_hpte_insert1:
- bl . /* 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 */
-
- /* physical address r5 */
- rldicl r5,r31,64-PTE_RPN_SHIFT,PTE_RPN_SHIFT
- sldi r5,r5,PAGE_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 r6,STK_PARAM(R4)(r1) /* Retrieve new pp bits */
- mr r4,r29 /* Retrieve vpn */
- li r7,HPTE_V_SECONDARY /* !bolted, secondary */
- li r8,MMU_PAGE_4K /* page size */
- li r9,MMU_PAGE_4K /* actual page size */
- ld r10,STK_PARAM(R9)(r1) /* segment size */
-.globl htab_call_hpte_insert2
-htab_call_hpte_insert2:
- bl . /* 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 */
-.globl htab_call_hpte_remove
-htab_call_hpte_remove:
- bl . /* Patched by htab_finish_init() */
-
- /* Try all again */
- b htab_insert_pte
-
-htab_bail_ok:
- li r3,0
- b htab_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_PARAM(R6)(r1)
- std r30,0(r6)
- li r3, 0
-htab_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_F_SECOND
- 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 /* vpn */
- li r6,MMU_PAGE_4K /* base page size */
- li r7,MMU_PAGE_4K /* actual page size */
- ld r8,STK_PARAM(R9)(r1) /* segment size */
- ld r9,STK_PARAM(R8)(r1) /* get "flags" param */
-.globl htab_call_hpte_updatepp
-htab_call_hpte_updatepp:
- bl . /* 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 htab_bail
-
-htab_pte_insert_failure:
- /* Bail out restoring old PTE */
- ld r6,STK_PARAM(R6)(r1)
- std r31,0(r6)
- li r3,-1
- b htab_bail
-
-#endif