From f6c2e3330d3fdd5474bc3756da46fca889a30e33 Mon Sep 17 00:00:00 2001 From: "Siddha, Suresh B" Date: Sat, 5 Nov 2005 17:25:53 +0100 Subject: [PATCH] x86_64: Unmap NULL during early bootup We should zap the low mappings, as soon as possible, so that we can catch kernel bugs more effectively. Previously early boot had NULL mapped and didn't trap on NULL references. This patch introduces boot_level4_pgt, which will always have low identity addresses mapped. Druing boot, all the processors will use this as their level4 pgt. On BP, we will switch to init_level4_pgt as soon as we enter C code and zap the low mappings as soon as we are done with the usage of identity low mapped addresses. On AP's we will zap the low mappings as soon as we jump to C code. Signed-off-by: Suresh Siddha Signed-off-by: Ashok Raj Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- include/asm-x86_64/pgtable.h | 1 + include/asm-x86_64/proto.h | 2 ++ include/asm-x86_64/smp.h | 1 - 3 files changed, 3 insertions(+), 1 deletion(-) (limited to 'include/asm-x86_64') diff --git a/include/asm-x86_64/pgtable.h b/include/asm-x86_64/pgtable.h index 7a07196a7202..a204efb553dc 100644 --- a/include/asm-x86_64/pgtable.h +++ b/include/asm-x86_64/pgtable.h @@ -16,6 +16,7 @@ extern pud_t level3_physmem_pgt[512]; extern pud_t level3_ident_pgt[512]; extern pmd_t level2_kernel_pgt[512]; extern pgd_t init_level4_pgt[]; +extern pgd_t boot_level4_pgt[]; extern unsigned long __supported_pte_mask; #define swapper_pg_dir init_level4_pgt diff --git a/include/asm-x86_64/proto.h b/include/asm-x86_64/proto.h index c251152a0658..34501086afef 100644 --- a/include/asm-x86_64/proto.h +++ b/include/asm-x86_64/proto.h @@ -11,6 +11,8 @@ struct pt_regs; extern void start_kernel(void); extern void pda_init(int); +extern void zap_low_mappings(int cpu); + extern void early_idt_handler(void); extern void mcheck_init(struct cpuinfo_x86 *c); diff --git a/include/asm-x86_64/smp.h b/include/asm-x86_64/smp.h index c57ce4071342..592161e979e5 100644 --- a/include/asm-x86_64/smp.h +++ b/include/asm-x86_64/smp.h @@ -47,7 +47,6 @@ extern void lock_ipi_call_lock(void); extern void unlock_ipi_call_lock(void); extern int smp_num_siblings; extern void smp_send_reschedule(int cpu); -extern void zap_low_mappings(void); void smp_stop_cpu(void); extern int smp_call_function_single(int cpuid, void (*func) (void *info), void *info, int retry, int wait); -- cgit v1.2.1