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| author |  Thomas Gleixner <tglx@linutronix.de>
| 2023-10-17 23:23:26 +0200 |
|---|---|---|
| committer |  Borislav Petkov (AMD) <bp@alien8.de>
| 2023-10-18 18:27:30 +0200 |
| commit | a62f4ca106fd250e9247decd100f3905131fc1fe (patch) | |
| tree | ca6390e5e813052afce2fdaa0e49c654ef47dd8b /arch/x86/kernel/head32.c | |
| parent | x86/boot: Use __pa_nodebug() in mk_early_pgtbl_32() (diff) | |
| download | linux-a62f4ca106fd250e9247decd100f3905131fc1fe.tar.gz linux-a62f4ca106fd250e9247decd100f3905131fc1fe.tar.bz2 linux-a62f4ca106fd250e9247decd100f3905131fc1fe.zip | |
x86/boot/32: De-uglify the 2/3 level paging difference in mk_early_pgtbl_32()
Move the ifdeffery out of the function and use proper typedefs to make it
work for both 2 and 3 level paging.
No functional change.
[ bp: Move mk_early_pgtbl_32() declaration into a header. ]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231017211722.111059491@linutronix.de
Diffstat (limited to 'arch/x86/kernel/head32.c')
| -rw-r--r-- | arch/x86/kernel/head32.c | 38 |
1 files changed, 20 insertions, 18 deletions
diff --git a/arch/x86/kernel/head32.c b/arch/x86/kernel/head32.c index 8fe0dd38fff0..2b6599807026 100644 --- a/arch/x86/kernel/head32.c +++ b/arch/x86/kernel/head32.c @@ -69,41 +69,43 @@ asmlinkage __visible void __init __noreturn i386_start_kernel(void) * to the first kernel PMD. Note the upper half of each PMD or PTE are * always zero at this stage. */ -void __init mk_early_pgtbl_32(void); +#ifdef CONFIG_X86_PAE +typedef pmd_t pl2_t; +#define pl2_base initial_pg_pmd +#define SET_PL2(val) { .pmd = (val), } +#else +typedef pgd_t pl2_t; +#define pl2_base initial_page_table +#define SET_PL2(val) { .pgd = (val), } +#endif void __init __no_stack_protector mk_early_pgtbl_32(void) { - pte_t pte, *ptep; - int i; - unsigned long *ptr; /* 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); -#ifdef CONFIG_X86_PAE - pmd_t pl2, *pl2p = (pmd_t *)__pa_nodebug(initial_pg_pmd); -#define SET_PL2(pl2, val) { (pl2).pmd = (val); } -#else - pgd_t pl2, *pl2p = (pgd_t *)__pa_nodebug(initial_page_table); -#define SET_PL2(pl2, val) { (pl2).pgd = (val); } -#endif + pte_t pte, *ptep = (pte_t *)__pa_nodebug(__brk_base); + pl2_t *pl2p = (pl2_t *)__pa_nodebug(pl2_base); + unsigned long *ptr; + int i; - ptep = (pte_t *)__pa_nodebug(__brk_base); pte.pte = PTE_IDENT_ATTR; while ((pte.pte & PTE_PFN_MASK) < limit) { + pl2_t pl2 = SET_PL2((unsigned long)ptep | PDE_IDENT_ATTR); - SET_PL2(pl2, (unsigned long)ptep | PDE_IDENT_ATTR); *pl2p = pl2; -#ifndef CONFIG_X86_PAE - /* Kernel PDE entry */ - *(pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2; -#endif + + if (!IS_ENABLED(CONFIG_X86_PAE)) { + /* Kernel PDE entry */ + *(pl2p + ((PAGE_OFFSET >> PGDIR_SHIFT))) = pl2; + } + for (i = 0; i < PTRS_PER_PTE; i++) { *ptep = pte; pte.pte += PAGE_SIZE; ptep++; } - pl2p++; } |