Both on 32 and 64 bits, we copy all the way up to the end of bss,
except that on 64 bits there is a hack to avoid copying on top of the
page tables. There is no point in copying bss at all, especially
since we are just about to zero it all anyway.
To clean up and unify the handling, we now do:
- copy from startup_32 to _bss.
- zero from _bss to _ebss.
- the _ebss symbol is aligned to an 8-byte boundary.
- the page tables are moved to a separate section.
Use _bss as the copy endpoint since _edata may be misaligned.
[ Impact: cleanup, trivial performance improvement ]
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* where decompression in place becomes safe.
*/
pushl %esi
* where decompression in place becomes safe.
*/
pushl %esi
- leal _ebss(%ebp), %esi
- leal _ebss(%ebx), %edi
- movl $(_ebss - startup_32), %ecx
+ leal _bss(%ebp), %esi
+ leal _bss(%ebx), %edi
+ movl $(_bss - startup_32), %ecx
* Clear BSS
*/
xorl %eax, %eax
* Clear BSS
*/
xorl %eax, %eax
- leal _edata(%ebx), %edi
leal _ebss(%ebx), %ecx
subl %edi, %ecx
cld
leal _ebss(%ebx), %ecx
subl %edi, %ecx
cld
* Copy the compressed kernel to the end of our buffer
* where decompression in place becomes safe.
*/
* Copy the compressed kernel to the end of our buffer
* where decompression in place becomes safe.
*/
- leaq _end_before_pgt(%rip), %r8
- leaq _end_before_pgt(%rbx), %r9
- movq $_end_before_pgt /* - $startup_32 */, %rcx
+ leaq _bss(%rip), %r8
+ leaq _bss(%rbx), %r9
+ movq $_bss /* - $startup_32 */, %rcx
1: subq $8, %r8
subq $8, %r9
movq 0(%r8), %rax
1: subq $8, %r8
subq $8, %r9
movq 0(%r8), %rax
* Clear BSS
*/
xorq %rax, %rax
* Clear BSS
*/
xorq %rax, %rax
- leaq _edata(%rbx), %rdi
- leaq _end_before_pgt(%rbx), %rcx
+ leaq _bss(%rbx), %rdi
+ leaq _ebss(%rbx), %rcx
subq %rdi, %rcx
cld
rep stosb
subq %rdi, %rcx
cld
rep stosb
boot_stack:
.fill BOOT_STACK_SIZE, 1, 0
boot_stack_end:
boot_stack:
.fill BOOT_STACK_SIZE, 1, 0
boot_stack_end:
+
+/*
+ * Space for page tables (not in .bss so not zeroed)
+ */
+ .section ".pgtable","a",@nobits
+ .balign 4096
+pgtable:
+ .fill 6*4096, 1, 0
+#include <asm/page_types.h>
+
#ifdef CONFIG_X86_64
OUTPUT_ARCH(i386:x86-64)
ENTRY(startup_64)
#ifdef CONFIG_X86_64
OUTPUT_ARCH(i386:x86-64)
ENTRY(startup_64)
*(.bss)
*(.bss.*)
*(COMMON)
*(.bss)
*(.bss.*)
*(COMMON)
-#ifdef CONFIG_X86_64
- . = ALIGN(8);
- _end_before_pgt = . ;
- . = ALIGN(4096);
- pgtable = . ;
- . = . + 4096 * 6;
-#endif
+ . = ALIGN(8); /* For convenience during zeroing */
+#ifdef CONFIG_X86_64
+ . = ALIGN(PAGE_SIZE);
+ .pgtable : {
+ _pgtable = . ;
+ *(.pgtable)
+ _epgtable = . ;
+ }
+#endif
+ _end = .;