diff options
| -rw-r--r-- | arch/arm64/kernel/head.S | 33 | ||||
| -rw-r--r-- | arch/arm64/kernel/vmlinux.lds.S | 3 |
2 files changed, 14 insertions, 22 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index ca5e5fbefcd3..2af518161f3a 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -177,17 +177,6 @@ SYM_CODE_START_LOCAL(preserve_boot_args) ret SYM_CODE_END(preserve_boot_args) -SYM_FUNC_START_LOCAL(clear_page_tables) - /* - * Clear the init page tables. - */ - adrp x0, init_pg_dir - adrp x1, init_pg_end - sub x2, x1, x0 - mov x1, xzr - b __pi_memset // tail call -SYM_FUNC_END(clear_page_tables) - /* * Macro to populate page table entries, these entries can be pointers to the next level * or last level entries pointing to physical memory. @@ -386,9 +375,9 @@ SYM_FUNC_START_LOCAL(create_idmap) map_memory x0, x1, x3, x6, x7, x3, IDMAP_PGD_ORDER, x10, x11, x12, x13, x14, EXTRA_SHIFT - /* Remap the kernel page tables r/w in the ID map */ + /* Remap BSS and the kernel page tables r/w in the ID map */ adrp x1, _text - adrp x2, init_pg_dir + adrp x2, __bss_start adrp x3, _end bic x4, x2, #SWAPPER_BLOCK_SIZE - 1 mov_q x5, SWAPPER_RW_MMUFLAGS @@ -489,14 +478,6 @@ SYM_FUNC_START_LOCAL(__primary_switched) mov x0, x20 bl set_cpu_boot_mode_flag - // Clear BSS - adr_l x0, __bss_start - mov x1, xzr - adr_l x2, __bss_stop - sub x2, x2, x0 - bl __pi_memset - dsb ishst // Make zero page visible to PTW - #if VA_BITS > 48 adr_l x8, vabits_actual // Set this early so KASAN early init str x25, [x8] // ... observes the correct value @@ -782,6 +763,15 @@ SYM_FUNC_START_LOCAL(__primary_switch) adrp x1, reserved_pg_dir adrp x2, init_idmap_pg_dir bl __enable_mmu + + // Clear BSS + adrp x0, __bss_start + mov x1, xzr + adrp x2, init_pg_end + sub x2, x2, x0 + bl __pi_memset + dsb ishst // Make zero page visible to PTW + #ifdef CONFIG_RELOCATABLE adrp x23, KERNEL_START and x23, x23, MIN_KIMG_ALIGN - 1 @@ -796,7 +786,6 @@ SYM_FUNC_START_LOCAL(__primary_switch) orr x23, x23, x0 // record kernel offset #endif #endif - bl clear_page_tables bl create_kernel_mapping adrp x1, init_pg_dir diff --git a/arch/arm64/kernel/vmlinux.lds.S b/arch/arm64/kernel/vmlinux.lds.S index 8dd5dda66f7c..8a3c6aacc355 100644 --- a/arch/arm64/kernel/vmlinux.lds.S +++ b/arch/arm64/kernel/vmlinux.lds.S @@ -311,12 +311,15 @@ SECTIONS __pecoff_data_rawsize = ABSOLUTE(. - __initdata_begin); _edata = .; + /* start of zero-init region */ BSS_SECTION(SBSS_ALIGN, 0, 0) . = ALIGN(PAGE_SIZE); init_pg_dir = .; . += INIT_DIR_SIZE; init_pg_end = .; + /* end of zero-init region */ + #ifdef CONFIG_RELOCATABLE . += SZ_4K; /* stack for the early relocation code */ early_init_stack = .; |