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authorSimon Glass <sjg@chromium.org>2012-12-13 20:48:42 +0000
committerTom Rini <trini@ti.com>2013-02-01 15:36:53 -0500
commit0cecc3b67938147bc9b9dfe55a8464b4dd4092de (patch)
tree5b112ad73ac1b4b8bd6def5ea7df1e28dfec1aec /arch/x86
parentdf4aa625a2a6dbc3151ca7aa5e0656f281416cfe (diff)
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x86: Set up the global data pointer in C instead of asm
We currently assume that the global data pointer is at the start of struct global_data. We want to remove this restriction, and it is easiest to do this in C. Remove the asm code and add equivalent code in C. This idea was proposed by Graeme Russ here: http://patchwork.ozlabs.org/patch/199741/ Signed-off-by: Simon Glass <sjg@chromium.org> [trini: Apply Graeme Russ' comments http://patchwork.ozlabs.org/patch/206305/ here, re-order] Signed-off-by: Tom Rini <trini@ti.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/cpu/cpu.c4
-rw-r--r--arch/x86/cpu/start.S6
2 files changed, 3 insertions, 7 deletions
diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
index 315e87a..4902f8b 100644
--- a/arch/x86/cpu/cpu.c
+++ b/arch/x86/cpu/cpu.c
@@ -100,7 +100,9 @@ void setup_gdt(gd_t *id, u64 *gdt_addr)
gdt_addr[X86_GDT_ENTRY_32BIT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff);
/* FS: data, read/write, 4 GB, base (Global Data Pointer) */
- gdt_addr[X86_GDT_ENTRY_32BIT_FS] = GDT_ENTRY(0xc093, (ulong)id, 0xfffff);
+ id->gd_addr = id;
+ gdt_addr[X86_GDT_ENTRY_32BIT_FS] = GDT_ENTRY(0xc093,
+ (ulong)&id->gd_addr, 0xfffff);
/* 16-bit CS: code, read/execute, 64 kB, base 0 */
gdt_addr[X86_GDT_ENTRY_16BIT_CS] = GDT_ENTRY(0x109b, 0, 0x0ffff);
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index e960e21..f389584 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -113,9 +113,6 @@ car_init_ret:
/* Set second parameter to setup_gdt */
movl %esp, %edx
- /* gd->gd_addr = gd (Required to allow gd->xyz to work) */
- movl %eax, (%eax)
-
/* Setup global descriptor table so gd->xyz works */
call setup_gdt
@@ -171,9 +168,6 @@ board_init_f_r_trampoline:
/* Set second parameter to setup_gdt */
movl %esp, %edx
- /* gd->gd_addr = gd (Required to allow gd->xyz to work) */
- movl %eax, (%eax)
-
/* Setup global descriptor table so gd->xyz works */
call setup_gdt