You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
351 lines
7.0 KiB
351 lines
7.0 KiB
20 years ago
|
/*
|
||
|
|
* linux/arch/m32r/mm/mmu.S
|
||
|
|
*
|
||
|
|
* Copyright (C) 2001 by Hiroyuki Kondo
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* $Id: mmu.S,v 1.15 2004/03/16 02:56:27 takata Exp $ */
|
||
|
|
|
||
|
|
#include <linux/config.h> /* CONFIG_MMU */
|
||
|
|
#include <linux/linkage.h>
|
||
|
|
#include <asm/assembler.h>
|
||
|
|
#include <asm/smp.h>
|
||
|
|
|
||
|
|
.text
|
||
|
|
#ifdef CONFIG_MMU
|
||
|
|
|
||
|
|
#include <asm/mmu_context.h>
|
||
|
|
#include <asm/page.h>
|
||
|
|
#include <asm/pgtable.h>
|
||
|
|
#include <asm/m32r.h>
|
||
|
|
|
||
|
|
/*
|
||
|
|
* TLB Miss Exception handler
|
||
|
|
*/
|
||
|
|
.balign 16
|
||
|
|
ENTRY(tme_handler)
|
||
|
|
.global tlb_entry_i_dat
|
||
|
|
.global tlb_entry_d_dat
|
||
|
|
|
||
|
|
SWITCH_TO_KERNEL_STACK
|
||
|
|
|
||
|
|
#if defined(CONFIG_ISA_M32R2)
|
||
|
|
st r0, @-sp
|
||
|
|
st r1, @-sp
|
||
|
|
st r2, @-sp
|
||
|
|
st r3, @-sp
|
||
|
|
|
||
|
|
seth r3, #high(MMU_REG_BASE)
|
||
|
|
ld r1, @(MESTS_offset, r3) ; r1: status (MESTS reg.)
|
||
|
|
ld r0, @(MDEVP_offset, r3) ; r0: PFN + ASID (MDEVP reg.)
|
||
|
|
st r1, @(MESTS_offset, r3) ; clear status (MESTS reg.)
|
||
|
|
and3 r1, r1, #(MESTS_IT)
|
||
|
|
bnez r1, 1f ; instruction TLB miss?
|
||
|
|
|
||
|
|
;; data TLB miss
|
||
|
|
;; input
|
||
|
|
;; r0: PFN + ASID (MDEVP reg.)
|
||
|
|
;; r1 - r3: free
|
||
|
|
;; output
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry base address
|
||
|
|
;; r2: &tlb_entry_{i|d}_dat
|
||
|
|
;; r3: free
|
||
|
|
|
||
|
|
#ifndef CONFIG_SMP
|
||
|
|
seth r2, #high(tlb_entry_d_dat)
|
||
|
|
or3 r2, r2, #low(tlb_entry_d_dat)
|
||
|
|
#else /* CONFIG_SMP */
|
||
|
|
ldi r1, #-8192
|
||
|
|
seth r2, #high(tlb_entry_d_dat)
|
||
|
|
or3 r2, r2, #low(tlb_entry_d_dat)
|
||
|
|
and r1, sp
|
||
|
|
ld r1, @(16, r1) ; current_thread_info->cpu
|
||
|
|
slli r1, #2
|
||
|
|
add r2, r1
|
||
|
|
#endif /* !CONFIG_SMP */
|
||
|
|
seth r1, #high(DTLB_BASE)
|
||
|
|
or3 r1, r1, #low(DTLB_BASE)
|
||
|
|
bra 2f
|
||
|
|
|
||
|
|
.balign 16
|
||
|
|
.fillinsn
|
||
|
|
1:
|
||
|
|
;; instrucntion TLB miss
|
||
|
|
;; input
|
||
|
|
;; r0: MDEVP reg. (included ASID)
|
||
|
|
;; r1 - r3: free
|
||
|
|
;; output
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry base address
|
||
|
|
;; r2: &tlb_entry_{i|d}_dat
|
||
|
|
;; r3: free
|
||
|
|
ldi r3, #-4096
|
||
|
|
and3 r0, r0, #(MMU_CONTEXT_ASID_MASK)
|
||
|
|
mvfc r1, bpc
|
||
|
|
and r1, r3
|
||
|
|
or r0, r1 ; r0: PFN + ASID
|
||
|
|
#ifndef CONFIG_SMP
|
||
|
|
seth r2, #high(tlb_entry_i_dat)
|
||
|
|
or3 r2, r2, #low(tlb_entry_i_dat)
|
||
|
|
#else /* CONFIG_SMP */
|
||
|
|
ldi r1, #-8192
|
||
|
|
seth r2, #high(tlb_entry_i_dat)
|
||
|
|
or3 r2, r2, #low(tlb_entry_i_dat)
|
||
|
|
and r1, sp
|
||
|
|
ld r1, @(16, r1) ; current_thread_info->cpu
|
||
|
|
slli r1, #2
|
||
|
|
add r2, r1
|
||
|
|
#endif /* !CONFIG_SMP */
|
||
|
|
seth r1, #high(ITLB_BASE)
|
||
|
|
or3 r1, r1, #low(ITLB_BASE)
|
||
|
|
|
||
|
|
.fillinsn
|
||
|
|
2:
|
||
|
|
;; select TLB entry
|
||
|
|
;; input
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry base address
|
||
|
|
;; r2: &tlb_entry_{i|d}_dat
|
||
|
|
;; r3: free
|
||
|
|
;; output
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry address
|
||
|
|
;; r2, r3: free
|
||
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
||
|
|
ld r3, @r2 || srli r1, #3
|
||
|
|
#else
|
||
|
|
ld r3, @r2
|
||
|
|
srli r1, #3
|
||
|
|
#endif
|
||
|
|
add r1, r3
|
||
|
|
; tlb_entry_{d|i}_dat++;
|
||
|
|
addi r3, #1
|
||
|
|
and3 r3, r3, #(NR_TLB_ENTRIES - 1)
|
||
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
||
|
|
st r3, @r2 || slli r1, #3
|
||
|
|
#else
|
||
|
|
st r3, @r2
|
||
|
|
slli r1, #3
|
||
|
|
#endif
|
||
|
|
|
||
|
|
;; load pte
|
||
|
|
;; input
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry address
|
||
|
|
;; r2, r3: free
|
||
|
|
;; output
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry address
|
||
|
|
;; r2: pte_data
|
||
|
|
;; r3: free
|
||
|
|
; pgd = *(unsigned long *)MPTB;
|
||
|
|
ld24 r2, #(-MPTB - 1)
|
||
|
|
srl3 r3, r0, #22
|
||
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
||
|
|
not r2, r2 || slli r3, #2 ; r3: pgd offset
|
||
|
|
#else
|
||
|
|
not r2, r2
|
||
|
|
slli r3, #2
|
||
|
|
#endif
|
||
|
|
ld r2, @r2 ; r2: pgd base addr (MPTB reg.)
|
||
|
|
or r3, r2 ; r3: pmd addr
|
||
|
|
|
||
|
|
; pmd = pmd_offset(pgd, address);
|
||
|
|
ld r3, @r3 ; r3: pmd data
|
||
|
|
ldi r2, #-4096
|
||
|
|
beqz r3, 3f ; pmd_none(*pmd) ?
|
||
|
|
|
||
|
|
; pte = pte_offset(pmd, address);
|
||
|
|
and r2, r3 ; r2: pte base addr
|
||
|
|
srl3 r3, r0, #10
|
||
|
|
and3 r3, r3, #0xffc ; r3: pte offset
|
||
|
|
or r3, r2
|
||
|
|
seth r2, #0x8000
|
||
|
|
or r3, r2 ; r3: pte addr
|
||
|
|
|
||
|
|
; pte_data = (unsigned long)pte_val(*pte);
|
||
|
|
ld r2, @r3 ; r2: pte data
|
||
|
|
or3 r2, r2, #2 ; _PAGE_PRESENT(=2)
|
||
|
|
|
||
|
|
.fillinsn
|
||
|
|
5:
|
||
|
|
;; set tlb
|
||
|
|
;; input
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry address
|
||
|
|
;; r2: pte_data
|
||
|
|
;; r3: free
|
||
|
|
st r0, @r1 ; set_tlb_tag(entry++, address);
|
||
|
|
st r2, @+r1 ; set_tlb_data(entry, pte_data);
|
||
|
|
|
||
|
|
.fillinsn
|
||
|
|
6:
|
||
|
|
ld r3, @sp+
|
||
|
|
ld r2, @sp+
|
||
|
|
ld r1, @sp+
|
||
|
|
ld r0, @sp+
|
||
|
|
rte
|
||
|
|
|
||
|
|
.fillinsn
|
||
|
|
3:
|
||
|
|
;; error
|
||
|
|
;; input
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry address
|
||
|
|
;; r2, r3: free
|
||
|
|
;; output
|
||
|
|
;; r0: PFN + ASID
|
||
|
|
;; r1: TLB entry address
|
||
|
|
;; r2: pte_data
|
||
|
|
;; r3: free
|
||
|
|
#ifdef CONFIG_ISA_DUAL_ISSUE
|
||
|
|
bra 5b || ldi r2, #2
|
||
|
|
#else
|
||
|
|
ldi r2, #2 ; r2: pte_data = 0 | _PAGE_PRESENT(=2)
|
||
|
|
bra 5b
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#elif defined (CONFIG_ISA_M32R)
|
||
|
|
|
||
|
|
st sp, @-sp
|
||
|
|
st r0, @-sp
|
||
|
|
st r1, @-sp
|
||
|
|
st r2, @-sp
|
||
|
|
st r3, @-sp
|
||
|
|
st r4, @-sp
|
||
|
|
|
||
|
|
seth r3, #high(MMU_REG_BASE)
|
||
|
|
ld r0, @(MDEVA_offset,r3) ; r0: address (MDEVA reg.)
|
||
|
|
mvfc r2, bpc ; r2: bpc
|
||
|
|
ld r1, @(MESTS_offset,r3) ; r1: status (MESTS reg.)
|
||
|
|
st r1, @(MESTS_offset,r3) ; clear status (MESTS reg.)
|
||
|
|
and3 r1, r1, #(MESTS_IT)
|
||
|
|
beqz r1, 1f ; data TLB miss?
|
||
|
|
|
||
|
|
;; instrucntion TLB miss
|
||
|
|
mv r0, r2 ; address = bpc;
|
||
|
|
; entry = (unsigned long *)ITLB_BASE+tlb_entry_i*2;
|
||
|
|
seth r3, #shigh(tlb_entry_i_dat)
|
||
|
|
ld r4, @(low(tlb_entry_i_dat),r3)
|
||
|
|
sll3 r2, r4, #3
|
||
|
|
seth r1, #high(ITLB_BASE)
|
||
|
|
or3 r1, r1, #low(ITLB_BASE)
|
||
|
|
add r2, r1 ; r2: entry
|
||
|
|
addi r4, #1 ; tlb_entry_i++;
|
||
|
|
and3 r4, r4, #(NR_TLB_ENTRIES-1)
|
||
|
|
st r4, @(low(tlb_entry_i_dat),r3)
|
||
|
|
bra 2f
|
||
|
|
.fillinsn
|
||
|
|
1:
|
||
|
|
;; data TLB miss
|
||
|
|
; entry = (unsigned long *)DTLB_BASE+tlb_entry_d*2;
|
||
|
|
seth r3, #shigh(tlb_entry_d_dat)
|
||
|
|
ld r4, @(low(tlb_entry_d_dat),r3)
|
||
|
|
sll3 r2, r4, #3
|
||
|
|
seth r1, #high(DTLB_BASE)
|
||
|
|
or3 r1, r1, #low(DTLB_BASE)
|
||
|
|
add r2, r1 ; r2: entry
|
||
|
|
addi r4, #1 ; tlb_entry_d++;
|
||
|
|
and3 r4, r4, #(NR_TLB_ENTRIES-1)
|
||
|
|
st r4, @(low(tlb_entry_d_dat),r3)
|
||
|
|
.fillinsn
|
||
|
|
2:
|
||
|
|
;; load pte
|
||
|
|
; r0: address, r2: entry
|
||
|
|
; r1,r3,r4: (free)
|
||
|
|
; pgd = *(unsigned long *)MPTB;
|
||
|
|
ld24 r1, #(-MPTB-1)
|
||
|
|
not r1, r1
|
||
|
|
ld r1, @r1
|
||
|
|
srl3 r4, r0, #22
|
||
|
|
sll3 r3, r4, #2
|
||
|
|
add r3, r1 ; r3: pgd
|
||
|
|
; pmd = pmd_offset(pgd, address);
|
||
|
|
ld r1, @r3 ; r1: pmd
|
||
|
|
beqz r1, 3f ; pmd_none(*pmd) ?
|
||
|
|
;
|
||
|
|
and3 r1, r1, #0xeff
|
||
|
|
ldi r4, #611 ; _KERNPG_TABLE(=611)
|
||
|
|
beq r1, r4, 4f ; !pmd_bad(*pmd) ?
|
||
|
|
.fillinsn
|
||
|
|
3:
|
||
|
|
ldi r1, #0 ; r1: pte_data = 0
|
||
|
|
bra 5f
|
||
|
|
.fillinsn
|
||
|
|
4:
|
||
|
|
; pte = pte_offset(pmd, address);
|
||
|
|
ld r4, @r3 ; r4: pte
|
||
|
|
ldi r3, #-4096
|
||
|
|
and r4, r3
|
||
|
|
srl3 r3, r0, #10
|
||
|
|
and3 r3, r3, #0xffc
|
||
|
|
add r4, r3
|
||
|
|
seth r3, #0x8000
|
||
|
|
add r4, r3 ; r4: pte
|
||
|
|
; pte_data = (unsigned long)pte_val(*pte);
|
||
|
|
ld r1, @r4 ; r1: pte_data
|
||
|
|
.fillinsn
|
||
|
|
|
||
|
|
;; set tlb
|
||
|
|
; r0: address, r1: pte_data, r2: entry
|
||
|
|
; r3,r4: (free)
|
||
|
|
5:
|
||
|
|
ldi r3, #-4096 ; set_tlb_tag(entry++, address);
|
||
|
|
and r3, r0
|
||
|
|
seth r4, #shigh(MASID)
|
||
|
|
ld r4, @(low(MASID),r4) ; r4: MASID
|
||
|
|
and3 r4, r4, #(MMU_CONTEXT_ASID_MASK)
|
||
|
|
or r3, r4
|
||
|
|
st r3, @r2
|
||
|
|
or3 r4, r1, #2 ; _PAGE_PRESENT(=2)
|
||
|
|
st r4, @(4,r2) ; set_tlb_data(entry, pte_data);
|
||
|
|
|
||
|
|
ld r4, @sp+
|
||
|
|
ld r3, @sp+
|
||
|
|
ld r2, @sp+
|
||
|
|
ld r1, @sp+
|
||
|
|
ld r0, @sp+
|
||
|
|
ld sp, @sp+
|
||
|
|
rte
|
||
|
|
|
||
|
|
#else
|
||
|
|
#error unknown isa configuration
|
||
|
|
#endif
|
||
|
|
|
||
|
|
ENTRY(init_tlb)
|
||
|
|
;; Set MMU Register
|
||
|
|
seth r0, #high(MMU_REG_BASE) ; Set MMU_REG_BASE higher
|
||
|
|
or3 r0, r0, #low(MMU_REG_BASE) ; Set MMU_REG_BASE lower
|
||
|
|
ldi r1, #0
|
||
|
|
st r1, @(MPSZ_offset,r0) ; Set MPSZ Reg(Page size 4KB:0 16KB:1 64KB:2)
|
||
|
|
ldi r1, #0
|
||
|
|
st r1, @(MASID_offset,r0) ; Set ASID Zero
|
||
|
|
|
||
|
|
;; Set TLB
|
||
|
|
seth r0, #high(ITLB_BASE) ; Set ITLB_BASE higher
|
||
|
|
or3 r0, r0, #low(ITLB_BASE) ; Set ITLB_BASE lower
|
||
|
|
seth r1, #high(DTLB_BASE) ; Set DTLB_BASE higher
|
||
|
|
or3 r1, r1, #low(DTLB_BASE) ; Set DTLB_BASE lower
|
||
|
|
ldi r2, #0
|
||
|
|
ldi r3, #NR_TLB_ENTRIES
|
||
|
|
addi r0, #-4
|
||
|
|
addi r1, #-4
|
||
|
|
clear_tlb:
|
||
|
|
st r2, @+r0 ; VPA <- 0
|
||
|
|
st r2, @+r0 ; PPA <- 0
|
||
|
|
st r2, @+r1 ; VPA <- 0
|
||
|
|
st r2, @+r1 ; PPA <- 0
|
||
|
|
addi r3, #-1
|
||
|
|
bnez r3, clear_tlb
|
||
|
|
;;
|
||
|
|
jmp r14
|
||
|
|
|
||
|
|
ENTRY(m32r_itlb_entrys)
|
||
|
|
ENTRY(m32r_otlb_entrys)
|
||
|
|
|
||
|
|
#endif /* CONFIG_MMU */
|
||
|
|
|
||
|
|
.end
|
||
|
|
|