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-rw-r--r--arch/x86/kernel/head_32.S21
1 files changed, 19 insertions, 2 deletions
diff --git a/arch/x86/kernel/head_32.S b/arch/x86/kernel/head_32.S
index 9150ca9b5f80..39677965e161 100644
--- a/arch/x86/kernel/head_32.S
+++ b/arch/x86/kernel/head_32.S
@@ -51,6 +51,15 @@
*/
LOW_PAGES = 1<<(32-PAGE_SHIFT_asm)
+/*
+ * To preserve the DMA pool in PAGEALLOC kernels, we'll allocate
+ * pagetables from above the 16MB DMA limit, so we'll have to set
+ * up pagetables 16MB more (worst-case):
+ */
+#ifdef CONFIG_DEBUG_PAGEALLOC
+LOW_PAGES = LOW_PAGES + 0x1000000
+#endif
+
#if PTRS_PER_PMD > 1
PAGE_TABLE_SIZE = (LOW_PAGES / PTRS_PER_PMD) + PTRS_PER_PGD
#else
@@ -443,6 +452,7 @@ early_page_fault:
early_fault:
cld
#ifdef CONFIG_PRINTK
+ pusha
movl $(__KERNEL_DS),%eax
movl %eax,%ds
movl %eax,%es
@@ -534,8 +544,15 @@ int_msg:
.asciz "Unknown interrupt or fault at EIP %p %p %p\n"
fault_msg:
- .ascii "Int %d: CR2 %p err %p EIP %p CS %p flags %p\n"
- .asciz "Stack: %p %p %p %p %p %p %p %p\n"
+ .ascii \
+/* fault info: */ "BUG: Int %d: CR2 %p\n" \
+/* pusha regs: */ " EDI %p ESI %p EBP %p ESP %p\n" \
+ " EBX %p EDX %p ECX %p EAX %p\n" \
+/* fault frame: */ " err %p EIP %p CS %p flg %p\n" \
+ \
+ "Stack: %p %p %p %p %p %p %p %p\n" \
+ " %p %p %p %p %p %p %p %p\n" \
+ " %p %p %p %p %p %p %p %p\n"
#include "../../x86/xen/xen-head.S"
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