From 8d61625d6a73307857f80002949583105545dbbc Mon Sep 17 00:00:00 2001 From: Graeme Russ Date: Tue, 27 Nov 2012 15:38:36 +0000 Subject: [PATCH] x86: Put global data on the stack Putting global data on the stack simplifies the init process (and makes it slightly quicker). During the 'flash' stage of the init sequence, global data is in the CAR stack. After SDRAM is initialised, global data is copied from CAR to the SDRAM stack Signed-off-by: Graeme Russ Signed-off-by: Simon Glass --- arch/x86/cpu/cpu.c | 6 --- arch/x86/cpu/start.S | 67 ++++++++++++++++++++++++++--- arch/x86/include/asm/global_data.h | 1 - arch/x86/include/asm/init_helpers.h | 1 - arch/x86/include/asm/processor.h | 1 + arch/x86/lib/board.c | 2 +- arch/x86/lib/init_helpers.c | 37 +--------------- include/configs/coreboot.h | 5 +-- include/configs/eNET.h | 6 --- 9 files changed, 65 insertions(+), 61 deletions(-) diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c index 67de6bcb38..9c2db9f21e 100644 --- a/arch/x86/cpu/cpu.c +++ b/arch/x86/cpu/cpu.c @@ -90,12 +90,6 @@ static void load_gdt(const u64 *boot_gdt, u16 num_entries) asm volatile("lgdtl %0\n" : : "m" (gdt)); } -void init_gd(gd_t *id, u64 *gdt_addr) -{ - id->gd_addr = id; - setup_gdt(id, gdt_addr); -} - void setup_gdt(gd_t *id, u64 *gdt_addr) { /* CS: code, read/execute, 4 GB, base 0 */ diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S index ee0dabe4bc..ec12e8044f 100644 --- a/arch/x86/cpu/start.S +++ b/arch/x86/cpu/start.S @@ -83,13 +83,33 @@ car_init_ret: * or fully initialised SDRAM - we really don't care which) * starting at CONFIG_SYS_CAR_ADDR to be used as a temporary stack */ - movl $CONFIG_SYS_INIT_SP_ADDR, %esp - /* Initialise the Global Data Pointer */ - movl $CONFIG_SYS_INIT_GD_ADDR, %eax - movl %eax, %edx - addl $GENERATED_GBL_DATA_SIZE, %edx - call init_gd; + /* Stack grows down from top of CAR */ + movl $(CONFIG_SYS_CAR_ADDR + CONFIG_SYS_CAR_SIZE), %esp + + /* Reserve space on stack for global data */ + subl $GENERATED_GBL_DATA_SIZE, %esp + + /* Align global data to 16-byte boundary */ + andl $0xfffffff0, %esp + + /* Setup first parameter to setup_gdt */ + movl %esp, %eax + + /* Reserve space for global descriptor table */ + subl $X86_GDT_SIZE, %esp + + /* Align temporary global descriptor table to 16-byte boundary */ + andl $0xfffffff0, %esp + + /* 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 /* Set parameter to board_init_f() to boot flags */ xorl %eax, %eax @@ -113,9 +133,42 @@ board_init_f_r_trampoline: * %eax = Address of top of new stack */ - /* Setup stack in RAM */ + /* Stack grows down from top of SDRAM */ movl %eax, %esp + /* Reserve space on stack for global data */ + subl $GENERATED_GBL_DATA_SIZE, %esp + + /* Align global data to 16-byte boundary */ + andl $0xfffffff0, %esp + + /* Setup first parameter to memcpy (and setup_gdt) */ + movl %esp, %eax + + /* Setup second parameter to memcpy */ + fs movl 0, %edx + + /* Set third parameter to memcpy */ + movl $GENERATED_GBL_DATA_SIZE, %ecx + + /* Copy global data from CAR to SDRAM stack */ + call memcpy + + /* Reserve space for global descriptor table */ + subl $X86_GDT_SIZE, %esp + + /* Align global descriptor table to 16-byte boundary */ + andl $0xfffffff0, %esp + + /* 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 + /* Re-enter U-Boot by calling board_init_f_r */ call board_init_f_r diff --git a/arch/x86/include/asm/global_data.h b/arch/x86/include/asm/global_data.h index 13a3ce8fbf..59c2a9095b 100644 --- a/arch/x86/include/asm/global_data.h +++ b/arch/x86/include/asm/global_data.h @@ -54,7 +54,6 @@ struct global_data { unsigned long relocaddr; /* Start address of U-Boot in RAM */ unsigned long start_addr_sp; /* start_addr_stackpointer */ unsigned long gdt_addr; /* Location of GDT */ - unsigned long new_gd_addr; /* New location of Global Data */ phys_size_t ram_size; /* RAM size */ unsigned long reset_status; /* reset status register at boot */ void **jt; /* jump table */ diff --git a/arch/x86/include/asm/init_helpers.h b/arch/x86/include/asm/init_helpers.h index 8afb443290..ade694fba3 100644 --- a/arch/x86/include/asm/init_helpers.h +++ b/arch/x86/include/asm/init_helpers.h @@ -29,7 +29,6 @@ int display_dram_config(void); int init_baudrate_f(void); int calculate_relocation_address(void); -int copy_gd_to_ram_f_r(void); int init_cache_f_r(void); int set_reloc_flag_r(void); diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 6eb518063b..17f27cbb68 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -41,6 +41,7 @@ enum { #else /* NOTE: If the above enum is modified, this define must be checked */ #define X86_GDT_ENTRY_32BIT_DS 3 +#define X86_GDT_NUM_ENTRIES 7 #endif #define X86_GDT_SIZE (X86_GDT_NUM_ENTRIES * X86_GDT_ENTRY_SIZE) diff --git a/arch/x86/lib/board.c b/arch/x86/lib/board.c index e5caf13561..a13f5c0e10 100644 --- a/arch/x86/lib/board.c +++ b/arch/x86/lib/board.c @@ -36,6 +36,7 @@ #include #include #include +#include #include #include @@ -121,7 +122,6 @@ init_fnc_t *init_sequence_f[] = { * initialise the CPU caches (to speed up the relocation process) */ init_fnc_t *init_sequence_f_r[] = { - copy_gd_to_ram_f_r, init_cache_f_r, copy_uboot_to_ram, clear_bss, diff --git a/arch/x86/lib/init_helpers.c b/arch/x86/lib/init_helpers.c index 2f718d7c4a..87c7263fcb 100644 --- a/arch/x86/lib/init_helpers.c +++ b/arch/x86/lib/init_helpers.c @@ -83,18 +83,8 @@ int calculate_relocation_address(void) * requirements */ - /* Global Data is at top of available memory */ + /* Stack is at top of available memory */ dest_addr = gd->ram_size; - dest_addr -= GENERATED_GBL_DATA_SIZE; - dest_addr &= ~15; - gd->new_gd_addr = dest_addr; - - /* GDT is below Global Data */ - dest_addr -= X86_GDT_SIZE; - dest_addr &= ~15; - gd->gdt_addr = dest_addr; - - /* Stack is below GDT */ gd->start_addr_sp = dest_addr; /* U-Boot is below the stack */ @@ -107,31 +97,6 @@ int calculate_relocation_address(void) return 0; } -int copy_gd_to_ram_f_r(void) -{ - gd_t *ram_gd; - - /* - * Global data is still in temporary memory (the CPU cache). - * calculate_relocation_address() has set gd->new_gd_addr to - * where the global data lives in RAM but getting it there - * safely is a bit tricky due to the 'F-Segment Hack' that - * we need to use for x86 - */ - ram_gd = (gd_t *)gd->new_gd_addr; - memcpy((void *)ram_gd, gd, sizeof(gd_t)); - - /* - * Reload the Global Descriptor Table so FS points to the - * in-RAM copy of Global Data (calculate_relocation_address() - * has already calculated the in-RAM location of the GDT) - */ - ram_gd->gd_addr = ram_gd; - init_gd(ram_gd, (u64 *)gd->gdt_addr); - - return 0; -} - int init_cache_f_r(void) { /* Initialise the CPU cache(s) */ diff --git a/include/configs/coreboot.h b/include/configs/coreboot.h index cc95e2be98..8d3c21f05d 100644 --- a/include/configs/coreboot.h +++ b/include/configs/coreboot.h @@ -210,12 +210,11 @@ * (128kB + Environment Sector Size) malloc pool */ #define CONFIG_SYS_STACK_SIZE (32 * 1024) -#define CONFIG_SYS_INIT_SP_ADDR (256 * 1024 + 16 * 1024) +#define CONFIG_SYS_CAR_ADDR 0x19200000 +#define CONFIG_SYS_CAR_SIZE (16 * 1024) #define CONFIG_SYS_MONITOR_BASE CONFIG_SYS_TEXT_BASE #define CONFIG_SYS_MONITOR_LEN (256 * 1024) #define CONFIG_SYS_MALLOC_LEN (0x20000 + 128 * 1024) -/* Address of temporary Global Data */ -#define CONFIG_SYS_INIT_GD_ADDR (256 * 1024) /* allow to overwrite serial and ethaddr */ diff --git a/include/configs/eNET.h b/include/configs/eNET.h index 4b1c21904c..28cf95b778 100644 --- a/include/configs/eNET.h +++ b/include/configs/eNET.h @@ -168,16 +168,10 @@ #define CONFIG_SYS_STACK_SIZE (32 * 1024) #define CONFIG_SYS_CAR_ADDR 0x19200000 #define CONFIG_SYS_CAR_SIZE (16 * 1024) -#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_CAR_ADDR + \ - CONFIG_SYS_CAR_SIZE) #define CONFIG_SYS_MONITOR_BASE CONFIG_SYS_TEXT_BASE #define CONFIG_SYS_MONITOR_LEN (256 * 1024) #define CONFIG_SYS_MALLOC_LEN (CONFIG_ENV_SECT_SIZE + \ 128*1024) -/* Address of temporary Global Data */ -#define CONFIG_SYS_INIT_GD_ADDR CONFIG_SYS_CAR_ADDR - - /* allow to overwrite serial and ethaddr */ #define CONFIG_ENV_OVERWRITE -- 2.39.5