From: Simon Glass Date: Thu, 13 Dec 2012 20:48:42 +0000 (+0000) Subject: x86: Set up the global data pointer in C instead of asm X-Git-Tag: v2013.04-rc1~122 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=0cecc3b67938147bc9b9dfe55a8464b4dd4092de;p=oweals%2Fu-boot.git 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 [trini: Apply Graeme Russ' comments http://patchwork.ozlabs.org/patch/206305/ here, re-order] Signed-off-by: Tom Rini --- diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c index 315e87afeb..4902f8bccc 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 e960e21f6e..f389584567 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