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| author | Michael Brown | 2007-06-28 22:56:14 +0200 |
|---|---|---|
| committer | Michael Brown | 2007-06-28 22:56:14 +0200 |
| commit | 045fb24557f4c0a11273b28150b9a870f248197d (patch) | |
| tree | 720765210b2f7e5a1544117f0551765b64923e10 /src | |
| parent | Revert "Move stack to below 0x7c00; leaving it at the default location" (diff) | |
| download | ipxe-045fb24557f4c0a11273b28150b9a870f248197d.tar.gz ipxe-045fb24557f4c0a11273b28150b9a870f248197d.tar.xz ipxe-045fb24557f4c0a11273b28150b9a870f248197d.zip | |
Use internal real-mode stack from non-returnable prefixes
Diffstat (limited to 'src')
| -rw-r--r-- | src/arch/i386/core/stack16.S | 13 | ||||
| -rw-r--r-- | src/arch/i386/prefix/dskprefix.S | 4 | ||||
| -rw-r--r-- | src/arch/i386/prefix/romprefix.S | 4 |
3 files changed, 21 insertions, 0 deletions
diff --git a/src/arch/i386/core/stack16.S b/src/arch/i386/core/stack16.S new file mode 100644 index 00000000..3380a083 --- /dev/null +++ b/src/arch/i386/core/stack16.S @@ -0,0 +1,13 @@ + .arch i386 + +/**************************************************************************** + * Internal stack + **************************************************************************** + */ + .section ".stack16" + .align 8 + .globl _stack16 +_stack16: + .space 4096 + .globl _estack16 +_estack16: diff --git a/src/arch/i386/prefix/dskprefix.S b/src/arch/i386/prefix/dskprefix.S index 9b1ebaaf..1a48716a 100644 --- a/src/arch/i386/prefix/dskprefix.S +++ b/src/arch/i386/prefix/dskprefix.S @@ -350,6 +350,10 @@ msg1end: start_runtime: call install + /* Set up real-mode stack */ + movw %bx, %ss + movw $_estack16, %sp + /* Jump to .text16 segment */ pushw %ax pushw $1f diff --git a/src/arch/i386/prefix/romprefix.S b/src/arch/i386/prefix/romprefix.S index ced0f49c..52001699 100644 --- a/src/arch/i386/prefix/romprefix.S +++ b/src/arch/i386/prefix/romprefix.S @@ -139,6 +139,10 @@ exec_vector: call install + /* Set up real-mode stack */ + movw %bx, %ss + movw $_estack16, %sp + /* Jump to .text16 segment */ pushw %ax pushw $1f |