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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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
View File

@ -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
View File

@ -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;