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|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <asm/asm.h>
#include <asm/export.h>
#include <asm/loongarch.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/regdef.h>
#include <asm/stackframe.h>
.macro tlb_do_page_fault, write
SYM_FUNC_START(tlb_do_page_fault_\write)
SAVE_ALL
csrrd a2, LOONGARCH_CSR_BADV
move a0, sp
REG_S a2, sp, PT_BVADDR
li.w a1, \write
la.abs t0, do_page_fault
jirl ra, t0, 0
RESTORE_ALL_AND_RET
SYM_FUNC_END(tlb_do_page_fault_\write)
.endm
tlb_do_page_fault 0
tlb_do_page_fault 1
SYM_FUNC_START(handle_tlb_protect)
BACKUP_T0T1
SAVE_ALL
move a0, sp
move a1, zero
csrrd a2, LOONGARCH_CSR_BADV
REG_S a2, sp, PT_BVADDR
la.abs t0, do_page_fault
jirl ra, t0, 0
RESTORE_ALL_AND_RET
SYM_FUNC_END(handle_tlb_protect)
SYM_FUNC_START(handle_tlb_load)
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
/*
* The vmalloc handling is not in the hotpath.
*/
csrrd t0, LOONGARCH_CSR_BADV
blt t0, $r0, vmalloc_load
csrrd t1, LOONGARCH_CSR_PGDL
vmalloc_done_load:
/* Get PGD offset in bytes */
srli.d t0, t0, PGDIR_SHIFT
andi t0, t0, (PTRS_PER_PGD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#if CONFIG_PGTABLE_LEVELS > 3
csrrd t0, LOONGARCH_CSR_BADV
ld.d t1, t1, 0
srli.d t0, t0, PUD_SHIFT
andi t0, t0, (PTRS_PER_PUD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#endif
#if CONFIG_PGTABLE_LEVELS > 2
csrrd t0, LOONGARCH_CSR_BADV
ld.d t1, t1, 0
srli.d t0, t0, PMD_SHIFT
andi t0, t0, (PTRS_PER_PMD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#endif
ld.d ra, t1, 0
/*
* For huge tlb entries, pmde doesn't contain an address but
* instead contains the tlb pte. Check the PAGE_HUGE bit and
* see if we need to jump to huge tlb processing.
*/
andi t0, ra, _PAGE_HUGE
bne t0, $r0, tlb_huge_update_load
csrrd t0, LOONGARCH_CSR_BADV
srli.d t0, t0, (PAGE_SHIFT + PTE_ORDER)
andi t0, t0, (PTRS_PER_PTE - 1)
slli.d t0, t0, _PTE_T_LOG2
add.d t1, ra, t0
ld.d t0, t1, 0
tlbsrch
srli.d ra, t0, _PAGE_PRESENT_SHIFT
andi ra, ra, 1
beq ra, $r0, nopage_tlb_load
ori t0, t0, _PAGE_VALID
st.d t0, t1, 0
ori t1, t1, 8
xori t1, t1, 8
ld.d t0, t1, 0
ld.d t1, t1, 8
csrwr t0, LOONGARCH_CSR_TLBELO0
csrwr t1, LOONGARCH_CSR_TLBELO1
tlbwr
leave_load:
csrrd t0, EXCEPTION_KS0
csrrd t1, EXCEPTION_KS1
csrrd ra, EXCEPTION_KS2
ertn
#ifdef CONFIG_64BIT
vmalloc_load:
la.abs t1, swapper_pg_dir
b vmalloc_done_load
#endif
/*
* This is the entry point when build_tlbchange_handler_head
* spots a huge page.
*/
tlb_huge_update_load:
ld.d t0, t1, 0
srli.d ra, t0, _PAGE_PRESENT_SHIFT
andi ra, ra, 1
beq ra, $r0, nopage_tlb_load
tlbsrch
ori t0, t0, _PAGE_VALID
st.d t0, t1, 0
addu16i.d t1, $r0, -(CSR_TLBIDX_EHINV >> 16)
addi.d ra, t1, 0
csrxchg ra, t1, LOONGARCH_CSR_TLBIDX
tlbwr
csrxchg $r0, t1, LOONGARCH_CSR_TLBIDX
/*
* A huge PTE describes an area the size of the
* configured huge page size. This is twice the
* of the large TLB entry size we intend to use.
* A TLB entry half the size of the configured
* huge page size is configured into entrylo0
* and entrylo1 to cover the contiguous huge PTE
* address space.
*/
/* Huge page: Move Global bit */
xori t0, t0, _PAGE_HUGE
lu12i.w t1, _PAGE_HGLOBAL >> 12
and t1, t0, t1
srli.d t1, t1, (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)
or t0, t0, t1
addi.d ra, t0, 0
csrwr t0, LOONGARCH_CSR_TLBELO0
addi.d t0, ra, 0
/* Convert to entrylo1 */
addi.d t1, $r0, 1
slli.d t1, t1, (HPAGE_SHIFT - 1)
add.d t0, t0, t1
csrwr t0, LOONGARCH_CSR_TLBELO1
/* Set huge page tlb entry size */
addu16i.d t0, $r0, (CSR_TLBIDX_PS >> 16)
addu16i.d t1, $r0, (PS_HUGE_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
tlbfill
addu16i.d t0, $r0, (CSR_TLBIDX_PS >> 16)
addu16i.d t1, $r0, (PS_DEFAULT_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
nopage_tlb_load:
csrrd ra, EXCEPTION_KS2
la.abs t0, tlb_do_page_fault_0
jirl $r0, t0, 0
SYM_FUNC_END(handle_tlb_load)
SYM_FUNC_START(handle_tlb_store)
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
/*
* The vmalloc handling is not in the hotpath.
*/
csrrd t0, LOONGARCH_CSR_BADV
blt t0, $r0, vmalloc_store
csrrd t1, LOONGARCH_CSR_PGDL
vmalloc_done_store:
/* Get PGD offset in bytes */
srli.d t0, t0, PGDIR_SHIFT
andi t0, t0, (PTRS_PER_PGD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#if CONFIG_PGTABLE_LEVELS > 3
csrrd t0, LOONGARCH_CSR_BADV
ld.d t1, t1, 0
srli.d t0, t0, PUD_SHIFT
andi t0, t0, (PTRS_PER_PUD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#endif
#if CONFIG_PGTABLE_LEVELS > 2
csrrd t0, LOONGARCH_CSR_BADV
ld.d t1, t1, 0
srli.d t0, t0, PMD_SHIFT
andi t0, t0, (PTRS_PER_PMD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#endif
ld.d ra, t1, 0
/*
* For huge tlb entries, pmde doesn't contain an address but
* instead contains the tlb pte. Check the PAGE_HUGE bit and
* see if we need to jump to huge tlb processing.
*/
andi t0, ra, _PAGE_HUGE
bne t0, $r0, tlb_huge_update_store
csrrd t0, LOONGARCH_CSR_BADV
srli.d t0, t0, (PAGE_SHIFT + PTE_ORDER)
andi t0, t0, (PTRS_PER_PTE - 1)
slli.d t0, t0, _PTE_T_LOG2
add.d t1, ra, t0
ld.d t0, t1, 0
tlbsrch
srli.d ra, t0, _PAGE_PRESENT_SHIFT
andi ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
xori ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
bne ra, $r0, nopage_tlb_store
ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
st.d t0, t1, 0
ori t1, t1, 8
xori t1, t1, 8
ld.d t0, t1, 0
ld.d t1, t1, 8
csrwr t0, LOONGARCH_CSR_TLBELO0
csrwr t1, LOONGARCH_CSR_TLBELO1
tlbwr
leave_store:
csrrd t0, EXCEPTION_KS0
csrrd t1, EXCEPTION_KS1
csrrd ra, EXCEPTION_KS2
ertn
#ifdef CONFIG_64BIT
vmalloc_store:
la.abs t1, swapper_pg_dir
b vmalloc_done_store
#endif
/*
* This is the entry point when build_tlbchange_handler_head
* spots a huge page.
*/
tlb_huge_update_store:
ld.d t0, t1, 0
srli.d ra, t0, _PAGE_PRESENT_SHIFT
andi ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
xori ra, ra, ((_PAGE_PRESENT | _PAGE_WRITE) >> _PAGE_PRESENT_SHIFT)
bne ra, $r0, nopage_tlb_store
tlbsrch
ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
st.d t0, t1, 0
addu16i.d t1, $r0, -(CSR_TLBIDX_EHINV >> 16)
addi.d ra, t1, 0
csrxchg ra, t1, LOONGARCH_CSR_TLBIDX
tlbwr
csrxchg $r0, t1, LOONGARCH_CSR_TLBIDX
/*
* A huge PTE describes an area the size of the
* configured huge page size. This is twice the
* of the large TLB entry size we intend to use.
* A TLB entry half the size of the configured
* huge page size is configured into entrylo0
* and entrylo1 to cover the contiguous huge PTE
* address space.
*/
/* Huge page: Move Global bit */
xori t0, t0, _PAGE_HUGE
lu12i.w t1, _PAGE_HGLOBAL >> 12
and t1, t0, t1
srli.d t1, t1, (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)
or t0, t0, t1
addi.d ra, t0, 0
csrwr t0, LOONGARCH_CSR_TLBELO0
addi.d t0, ra, 0
/* Convert to entrylo1 */
addi.d t1, $r0, 1
slli.d t1, t1, (HPAGE_SHIFT - 1)
add.d t0, t0, t1
csrwr t0, LOONGARCH_CSR_TLBELO1
/* Set huge page tlb entry size */
addu16i.d t0, $r0, (CSR_TLBIDX_PS >> 16)
addu16i.d t1, $r0, (PS_HUGE_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
tlbfill
/* Reset default page size */
addu16i.d t0, $r0, (CSR_TLBIDX_PS >> 16)
addu16i.d t1, $r0, (PS_DEFAULT_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
nopage_tlb_store:
csrrd ra, EXCEPTION_KS2
la.abs t0, tlb_do_page_fault_1
jirl $r0, t0, 0
SYM_FUNC_END(handle_tlb_store)
SYM_FUNC_START(handle_tlb_modify)
csrwr t0, EXCEPTION_KS0
csrwr t1, EXCEPTION_KS1
csrwr ra, EXCEPTION_KS2
/*
* The vmalloc handling is not in the hotpath.
*/
csrrd t0, LOONGARCH_CSR_BADV
blt t0, $r0, vmalloc_modify
csrrd t1, LOONGARCH_CSR_PGDL
vmalloc_done_modify:
/* Get PGD offset in bytes */
srli.d t0, t0, PGDIR_SHIFT
andi t0, t0, (PTRS_PER_PGD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#if CONFIG_PGTABLE_LEVELS > 3
csrrd t0, LOONGARCH_CSR_BADV
ld.d t1, t1, 0
srli.d t0, t0, PUD_SHIFT
andi t0, t0, (PTRS_PER_PUD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#endif
#if CONFIG_PGTABLE_LEVELS > 2
csrrd t0, LOONGARCH_CSR_BADV
ld.d t1, t1, 0
srli.d t0, t0, PMD_SHIFT
andi t0, t0, (PTRS_PER_PMD - 1)
slli.d t0, t0, 3
add.d t1, t1, t0
#endif
ld.d ra, t1, 0
/*
* For huge tlb entries, pmde doesn't contain an address but
* instead contains the tlb pte. Check the PAGE_HUGE bit and
* see if we need to jump to huge tlb processing.
*/
andi t0, ra, _PAGE_HUGE
bne t0, $r0, tlb_huge_update_modify
csrrd t0, LOONGARCH_CSR_BADV
srli.d t0, t0, (PAGE_SHIFT + PTE_ORDER)
andi t0, t0, (PTRS_PER_PTE - 1)
slli.d t0, t0, _PTE_T_LOG2
add.d t1, ra, t0
ld.d t0, t1, 0
tlbsrch
srli.d ra, t0, _PAGE_WRITE_SHIFT
andi ra, ra, 1
beq ra, $r0, nopage_tlb_modify
ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
st.d t0, t1, 0
ori t1, t1, 8
xori t1, t1, 8
ld.d t0, t1, 0
ld.d t1, t1, 8
csrwr t0, LOONGARCH_CSR_TLBELO0
csrwr t1, LOONGARCH_CSR_TLBELO1
tlbwr
leave_modify:
csrrd t0, EXCEPTION_KS0
csrrd t1, EXCEPTION_KS1
csrrd ra, EXCEPTION_KS2
ertn
#ifdef CONFIG_64BIT
vmalloc_modify:
la.abs t1, swapper_pg_dir
b vmalloc_done_modify
#endif
/*
* This is the entry point when
* build_tlbchange_handler_head spots a huge page.
*/
tlb_huge_update_modify:
ld.d t0, t1, 0
srli.d ra, t0, _PAGE_WRITE_SHIFT
andi ra, ra, 1
beq ra, $r0, nopage_tlb_modify
tlbsrch
ori t0, t0, (_PAGE_VALID | _PAGE_DIRTY | _PAGE_MODIFIED)
st.d t0, t1, 0
/*
* A huge PTE describes an area the size of the
* configured huge page size. This is twice the
* of the large TLB entry size we intend to use.
* A TLB entry half the size of the configured
* huge page size is configured into entrylo0
* and entrylo1 to cover the contiguous huge PTE
* address space.
*/
/* Huge page: Move Global bit */
xori t0, t0, _PAGE_HUGE
lu12i.w t1, _PAGE_HGLOBAL >> 12
and t1, t0, t1
srli.d t1, t1, (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT)
or t0, t0, t1
addi.d ra, t0, 0
csrwr t0, LOONGARCH_CSR_TLBELO0
addi.d t0, ra, 0
/* Convert to entrylo1 */
addi.d t1, $r0, 1
slli.d t1, t1, (HPAGE_SHIFT - 1)
add.d t0, t0, t1
csrwr t0, LOONGARCH_CSR_TLBELO1
/* Set huge page tlb entry size */
addu16i.d t0, $r0, (CSR_TLBIDX_PS >> 16)
addu16i.d t1, $r0, (PS_HUGE_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
tlbwr
/* Reset default page size */
addu16i.d t0, $r0, (CSR_TLBIDX_PS >> 16)
addu16i.d t1, $r0, (PS_DEFAULT_SIZE << (CSR_TLBIDX_PS_SHIFT - 16))
csrxchg t1, t0, LOONGARCH_CSR_TLBIDX
nopage_tlb_modify:
csrrd ra, EXCEPTION_KS2
la.abs t0, tlb_do_page_fault_1
jirl $r0, t0, 0
SYM_FUNC_END(handle_tlb_modify)
SYM_FUNC_START(handle_tlb_refill)
csrwr t0, LOONGARCH_CSR_TLBRSAVE
csrrd t0, LOONGARCH_CSR_PGD
lddir t0, t0, 3
#if CONFIG_PGTABLE_LEVELS > 3
lddir t0, t0, 2
#endif
#if CONFIG_PGTABLE_LEVELS > 2
lddir t0, t0, 1
#endif
ldpte t0, 0
ldpte t0, 1
tlbfill
csrrd t0, LOONGARCH_CSR_TLBRSAVE
ertn
SYM_FUNC_END(handle_tlb_refill)
|
