diff options
| author | Ard Biesheuvel <[email protected]> | 2024-02-21 12:35:12 +0100 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2024-02-26 12:58:35 +0100 |
| commit | eb54c2ae4a4825c42a6a2b4022926bda7448f735 (patch) | |
| tree | df7b2d9cec5198851e6677dbeb3d1cade5be2035 | |
| parent | 4f8b6cf25f5c119b117cb2a4bacb604a6cd00ff1 (diff) | |
x86/boot/64: Use RIP_REL_REF() to access early page tables
The early statically allocated page tables are populated from code that
executes from a 1:1 mapping so it cannot use plain accesses from C.
Replace the use of fixup_pointer() with RIP_REL_REF(), which is better
and simpler.
Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
| -rw-r--r-- | arch/x86/kernel/head64.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c index e2573ddae32f..7e2c9b581d58 100644 --- a/arch/x86/kernel/head64.c +++ b/arch/x86/kernel/head64.c @@ -215,13 +215,11 @@ unsigned long __head __startup_64(unsigned long physaddr, p4d[511] += load_delta; } - pud = fixup_pointer(level3_kernel_pgt, physaddr); - pud[510] += load_delta; - pud[511] += load_delta; + RIP_REL_REF(level3_kernel_pgt)[PTRS_PER_PUD - 2].pud += load_delta; + RIP_REL_REF(level3_kernel_pgt)[PTRS_PER_PUD - 1].pud += load_delta; - pmd = fixup_pointer(level2_fixmap_pgt, physaddr); for (i = FIXMAP_PMD_TOP; i > FIXMAP_PMD_TOP - FIXMAP_PMD_NUM; i--) - pmd[i] += load_delta; + RIP_REL_REF(level2_fixmap_pgt)[i].pmd += load_delta; /* * Set up the identity mapping for the switchover. These @@ -284,7 +282,7 @@ unsigned long __head __startup_64(unsigned long physaddr, * error, causing the BIOS to halt the system. */ - pmd = fixup_pointer(level2_kernel_pgt, physaddr); + pmd = &RIP_REL_REF(level2_kernel_pgt)->pmd; /* invalidate pages before the kernel image */ for (i = 0; i < pmd_index((unsigned long)_text); i++) |