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powerpc: Define swapper_pg_dir[] in C

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Don't duplicate swapper_pg_dir[] in each platform's head.S

Define it in mm/pgtable.c

Define MAX_PTRS_PER_PGD because on book3s/64 PTRS_PER_PGD is
not a constant.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/5e3f1b8a4695c33ccc80aa3870e016bef32b85e1.1623063174.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2021-06-07 10:56:05 +00:00 committed by Michael Ellerman
parent 45b30fafe5
commit e72421a085
10 changed files with 10 additions and 81 deletions
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3
arch/powerpc/include/asm/book3s/64/pgtable.h
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@ -232,6 +232,9 @@ extern unsigned long __pmd_frag_size_shift;
#define PTRS_PER_PUD (1 << PUD_INDEX_SIZE)
#define PTRS_PER_PGD (1 << PGD_INDEX_SIZE)
#define MAX_PTRS_PER_PGD (1 << (H_PGD_INDEX_SIZE > RADIX_PGD_INDEX_SIZE ? \
H_PGD_INDEX_SIZE : RADIX_PGD_INDEX_SIZE))
/* PMD_SHIFT determines what a second-level page table entry can map */
#define PMD_SHIFT (PAGE_SHIFT + PTE_INDEX_SIZE)
#define PMD_SIZE (1UL << PMD_SHIFT)

4
arch/powerpc/include/asm/pgtable.h
View File

@ -41,6 +41,10 @@ struct mm_struct;
#ifndef __ASSEMBLY__
#ifndef MAX_PTRS_PER_PGD
#define MAX_PTRS_PER_PGD PTRS_PER_PGD
#endif
/* Keep these as a macros to avoid include dependency mess */
#define pte_page(x) pfn_to_page(pte_pfn(x))
#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))

5
arch/powerpc/kernel/asm-offsets.c
View File

@ -354,11 +354,6 @@ int main(void)
DEFINE(BUG_ENTRY_SIZE, sizeof(struct bug_entry));
#endif
#ifdef CONFIG_PPC_BOOK3S_64
DEFINE(PGD_TABLE_SIZE, (sizeof(pgd_t) << max(RADIX_PGD_INDEX_SIZE, H_PGD_INDEX_SIZE)));
#else
DEFINE(PGD_TABLE_SIZE, PGD_TABLE_SIZE);
#endif
DEFINE(PTE_SIZE, sizeof(pte_t));
#ifdef CONFIG_KVM

11
arch/powerpc/kernel/head_40x.S
View File

@ -701,14 +701,3 @@ _GLOBAL(abort)
mfspr r13,SPRN_DBCR0
oris r13,r13,DBCR0_RST_SYSTEM@h
mtspr SPRN_DBCR0,r13
/* We put a few things here that have to be page-aligned. This stuff
* goes at the beginning of the data segment, which is page-aligned.
*/
.data
.align 12
.globl sdata
sdata:
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE

17
arch/powerpc/kernel/head_44x.S
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@ -1233,23 +1233,8 @@ head_start_common:
isync
blr
/*
* We put a few things here that have to be page-aligned. This stuff
* goes at the beginning of the data segment, which is page-aligned.
*/
.data
.align PAGE_SHIFT
.globl sdata
sdata:
/*
* To support >32-bit physical addresses, we use an 8KB pgdir.
*/
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE
#ifdef CONFIG_SMP
.data
.align 12
temp_boot_stack:
.space 1024

15
arch/powerpc/kernel/head_64.S
View File

@ -997,18 +997,3 @@ start_here_common:
0: trap
EMIT_BUG_ENTRY 0b, __FILE__, __LINE__, 0
.previous
/*
* We put a few things here that have to be page-aligned.
* This stuff goes at the beginning of the bss, which is page-aligned.
*/
.section ".bss"
/*
* pgd dir should be aligned to PGD_TABLE_SIZE which is 64K.
* We will need to find a better way to fix this
*/
.align 16
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE

12
arch/powerpc/kernel/head_8xx.S
View File

@ -786,15 +786,3 @@ _GLOBAL(mmu_pin_tlb)
mtspr SPRN_SRR1, r10
mtspr SPRN_SRR0, r11
rfi
/*
* We put a few things here that have to be page-aligned.
* This stuff goes at the beginning of the data segment,
* which is page-aligned.
*/
.data
.globl sdata
sdata:
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE

10
arch/powerpc/kernel/head_book3s_32.S
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@ -1208,14 +1208,4 @@ setup_usbgecko_bat:
blr
#endif
/*
* We put a few things here that have to be page-aligned.
* This stuff goes at the beginning of the data segment,
* which is page-aligned.
*/
.data
.globl sdata
sdata:
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE

12
arch/powerpc/kernel/head_fsl_booke.S
View File

@ -1212,15 +1212,3 @@ _GLOBAL(restore_to_as0)
*/
3: mr r3,r5
bl _start
/*
* We put a few things here that have to be page-aligned. This stuff
* goes at the beginning of the data segment, which is page-aligned.
*/
.data
.align 12
.globl sdata
sdata:
.globl swapper_pg_dir
swapper_pg_dir:
.space PGD_TABLE_SIZE

2
arch/powerpc/mm/pgtable.c
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@ -28,6 +28,8 @@
#include <asm/hugetlb.h>
#include <asm/pte-walk.h>
pgd_t swapper_pg_dir[MAX_PTRS_PER_PGD] __page_aligned_bss;
static inline int is_exec_fault(void)
{
return current->thread.regs && TRAP(current->thread.regs) == 0x400;