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| author |  Thomas Gleixner <tglx@linutronix.de>
| 2023-10-17 23:23:28 +0200 |
|---|---|---|
| committer |  Borislav Petkov (AMD) <bp@alien8.de>
| 2023-10-18 18:28:41 +0200 |
| commit | 69ba866db281c768d5ecca909361ea4c4e71d57e (patch) | |
| tree | db37b656e8f91d7e14e2964abd4cbc34666a6bd0 /arch/x86/kernel | |
| parent | x86/boot/32: De-uglify the 2/3 level paging difference in mk_early_pgtbl_32() (diff) | |
| download | linux-69ba866db281c768d5ecca909361ea4c4e71d57e.tar.gz linux-69ba866db281c768d5ecca909361ea4c4e71d57e.tar.bz2 linux-69ba866db281c768d5ecca909361ea4c4e71d57e.zip | |
x86/boot/32: Restructure mk_early_pgtbl_32()
Prepare it for adding a temporary initrd mapping by splitting out the
actual map loop.
No functional change.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231017211722.175910753@linutronix.de
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/head32.c | 42 |
1 files changed, 23 insertions, 19 deletions
diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c index 2b6599807026..bdce6321fabd 100644 --- a/arch/x86/kernel/head32.c +++ b/arch/x86/kernel/head32.c @@ -79,35 +79,40 @@ typedef pgd_t pl2_t; #define SET_PL2(val) { .pgd = (val), } #endif -void __init __no_stack_protector mk_early_pgtbl_32(void) +static __init __no_stack_protector pte_t init_map(pte_t pte, pte_t **ptep, pl2_t **pl2p, + const unsigned long limit) { - /* Enough space to fit pagetables for the low memory linear map */ - const unsigned long limit = __pa_nodebug(_end) + - (PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT); - pte_t pte, *ptep = (pte_t *)__pa_nodebug(__brk_base); - pl2_t *pl2p = (pl2_t *)__pa_nodebug(pl2_base); - unsigned long *ptr; - int i; - - pte.pte = PTE_IDENT_ATTR; - while ((pte.pte & PTE_PFN_MASK) < limit) { - pl2_t pl2 = SET_PL2((unsigned long)ptep | PDE_IDENT_ATTR); - - *pl2p = pl2; + pl2_t pl2 = SET_PL2((unsigned long)*ptep | PDE_IDENT_ATTR); + int i; + **pl2p = pl2; if (!IS_ENABLED(CONFIG_X86_PAE)) { /* Kernel PDE entry */ - *(pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2; + *(*pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2; } for (i = 0; i < PTRS_PER_PTE; i++) { - *ptep = pte; + **ptep = pte; pte.pte += PAGE_SIZE; - ptep++; + (*ptep)++; } - pl2p++; + (*pl2p)++; } + return pte; +} + +void __init __no_stack_protector mk_early_pgtbl_32(void) +{ + /* Enough space to fit pagetables for the low memory linear map */ + const unsigned long limit = __pa_nodebug(_end) + + (PAGE_TABLE_SIZE(LOWMEM_PAGES) << PAGE_SHIFT); + pte_t pte, *ptep = (pte_t *)__pa_nodebug(__brk_base); + pl2_t *pl2p = (pl2_t *)__pa_nodebug(pl2_base); + unsigned long *ptr; + + pte.pte = PTE_IDENT_ATTR; + pte = init_map(pte, &ptep, &pl2p, limit); ptr = (unsigned long *)__pa_nodebug(&max_pfn_mapped); /* Can't use pte_pfn() since it's a call with CONFIG_PARAVIRT */ @@ -116,4 +121,3 @@ void __init __no_stack_protector mk_early_pgtbl_32(void) ptr = (unsigned long *)__pa_nodebug(&_brk_end); *ptr = (unsigned long)ptep + PAGE_OFFSET; } - |