/*
* U-boot - i386 Startup Code
*
- * Copyright (c) 2002 Omicron Ceti AB, Daniel Engström <denaiel@omicron.se>
+ * Copyright (c) 2002 Omicron Ceti AB, Daniel Engstr�m <denaiel@omicron.se>
*
* See file CREDITS for list of people who contributed to this
* project.
#include <config.h>
#include <version.h>
+#include <asm/global_data.h>
.section .text
/* Turn of cache (this might require a 486-class CPU) */
movl %cr0, %eax
- orl $0x60000000,%eax
+ orl $0x60000000, %eax
movl %eax, %cr0
wbinvd
_start:
/* This is the 32-bit cold-reset entry point */
- movl $0x18,%eax /* Load our segement registes, the
+ movl $0x18, %eax /* Load our segement registes, the
* gdt have already been loaded by start16.S */
- movw %ax,%fs
- movw %ax,%ds
- movw %ax,%gs
- movw %ax,%es
- movw %ax,%ss
+ movw %ax, %fs
+ movw %ax, %ds
+ movw %ax, %gs
+ movw %ax, %es
+ movw %ax, %ss
/* Clear the interupt vectors */
lidt blank_idt_ptr
* to store the return address */
/* Early platform init (setup gpio, etc ) */
- mov $early_board_init_ret, %ebp
jmp early_board_init
+.globl early_board_init_ret
early_board_init_ret:
- /* The __port80 entry-point should be usabe by now */
- /* so we try to indicate progress */
- movw $0x01, %ax
- movl $.progress0, %ebp
- jmp show_boot_progress_asm
-.progress0:
-
/* size memory */
- mov $mem_init_ret, %ebp
- jmp mem_init
+ jmp mem_init
+.globl mem_init_ret
mem_init_ret:
/* fetch memory size (into %eax) */
- mov $get_mem_size_ret, %ebp
- jmp get_mem_size
+ jmp get_mem_size
+.globl get_mem_size_ret
get_mem_size_ret:
- /*
- * We are now in 'Flat Protected Mode' and we know how much memory
- * the board has. The (temporary) Global Descriptor Table is not
- * in a 'Safe' place (it is either in Flash which can be erased or
- * reprogrammed or in a fail-safe boot-strap image which could be
- * over-written).
- *
- * Move the final gdt to a safe place (top of RAM) and load it.
- * This is not a trivial excercise - the lgdt instruction does not
- * have a register operand (memory only) and we may well be
- * running from Flash, so self modifying code will not work here.
- * To overcome this, we copy a stub into upper memory along with
- * the GDT.
- */
-
- /* Reduce upper memory limit by (Stub + GDT Pointer + GDT) */
- subl $(end_gdt_setup - start_gdt_setup), %eax
-
- /* Copy the GDT and Stub */
- movl $start_gdt_setup, %esi
- movl %eax, %edi
- movl $(end_gdt_setup - start_gdt_setup), %ecx
- shrl $2, %ecx
- cld
- rep movsl
-
- /* write the lgdt 'parameter' */
- subl $(jmp_instr - start_gdt_setup - 4), %ebp
- addl %eax, %ebp
- movl $(gdt_ptr - start_gdt_setup), %ebx
- addl %eax, %ebx
- movl %ebx, (%ebp)
+#if CONFIG_SYS_SDRAM_ECC_ENABLE
+ /* Skip ECC initialization if not starting from cold-reset */
+ movl %ebx, %ecx
+ andl $GD_FLG_COLD_BOOT, %ecx
+ jz init_ecc_ret
+ jmp init_ecc
- /* write the gdt address into the pointer */
- movl $(gdt_addr - start_gdt_setup), %ebp
- addl %eax, %ebp
- movl $(gdt - start_gdt_setup), %ebx
- addl %eax, %ebx
- movl %ebx, (%ebp)
+.globl init_ecc_ret
+init_ecc_ret:
+#endif
- /* Save the return address */
- movl $load_gdt_ret, %ebp
-
- /* Load the new (safe) Global Descriptor Table */
- jmp *%eax
-
-load_gdt_ret:
/* Check we have enough memory for stack */
movl $CONFIG_SYS_STACK_SIZE, %ecx
cmpl %ecx, %eax
- jae mem_ok
-
- /* indicate (lack of) progress */
- movw $0x81, %ax
- movl $.progress0a, %ebp
- jmp show_boot_progress_asm
-.progress0a:
- jmp die
+ jb die
mem_ok:
/* Set stack pointer to upper memory limit*/
- movl %eax, %esp
-
- /* indicate progress */
- movw $0x02, %ax
- movl $.progress1, %ebp
- jmp show_boot_progress_asm
-.progress1:
+ movl %eax, %esp
/* Test the stack */
pushl $0
- popl %eax
- cmpl $0, %eax
- jne no_stack
+ popl %ecx
+ cmpl $0, %ecx
+ jne die
push $0x55aa55aa
- popl %ebx
- cmpl $0x55aa55aa, %ebx
- je stack_ok
-
-no_stack:
- /* indicate (lack of) progress */
- movw $0x82, %ax
- movl $.progress1a, %ebp
- jmp show_boot_progress_asm
-.progress1a:
- jmp die
-
-
-stack_ok:
- /* indicate progress */
- movw $0x03, %ax
- movl $.progress2, %ebp
- jmp show_boot_progress_asm
-.progress2:
+ popl %ecx
+ cmpl $0x55aa55aa, %ecx
+ jne die
wbinvd
- /* Get upper memory limit */
- movl %esp, %ecx
- subl $CONFIG_SYS_STACK_SIZE, %ecx
+ /* Set the upper memory limit parameter */
+ subl $CONFIG_SYS_STACK_SIZE, %eax
+
+ /* Reserve space for global data */
+ subl $(GD_SIZE * 4), %eax
- /* Create a Stack Frame */
- pushl %ebp
- movl %esp, %ebp
+ /* %eax points to the global data structure */
+ movl %esp, (GD_RAM_SIZE * 4)(%eax)
+ movl %ebx, (GD_FLAGS * 4)(%eax)
- /* stack_limit parameter */
- pushl %ecx
call board_init_f /* Enter, U-boot! */
/* indicate (lack of) progress */
movw $0x85, %ax
- movl $.progress4a, %ebp
- jmp show_boot_progress_asm
-.progress4a:
-
die: hlt
jmp die
hlt
blank_idt_ptr:
.word 0 /* limit */
.long 0 /* base */
-
-.align 4
-start_gdt_setup:
- lgdt gdt_ptr
-jmp_instr:
- jmp *%ebp
-
-.align 4
-gdt_ptr:
- .word 0x30 /* limit (48 bytes = 6 GDT entries) */
-gdt_addr:
- .long gdt /* base */
-
- /* The GDT table ...
- *
- * Selector Type
- * 0x00 NULL
- * 0x08 Unused
- * 0x10 32bit code
- * 0x18 32bit data/stack
- * 0x20 16bit code
- * 0x28 16bit data/stack
- */
-
-.align 4
-gdt:
- .word 0, 0, 0, 0 /* NULL */
- .word 0, 0, 0, 0 /* unused */
-
- .word 0xFFFF /* 4Gb - (0x100000*0x1000 = 4Gb) */
- .word 0 /* base address = 0 */
- .word 0x9B00 /* code read/exec */
- .word 0x00CF /* granularity = 4096, 386 (+5th nibble of limit) */
-
- .word 0xFFFF /* 4Gb - (0x100000*0x1000 = 4Gb) */
- .word 0x0 /* base address = 0 */
- .word 0x9300 /* data read/write */
- .word 0x00CF /* granularity = 4096, 386 (+5th nibble of limit) */
-
- .word 0xFFFF /* 64kb */
- .word 0 /* base address = 0 */
- .word 0x9b00 /* data read/write */
- .word 0x0010 /* granularity = 1 (+5th nibble of limit) */
-
- .word 0xFFFF /* 64kb */
- .word 0 /* base address = 0 */
- .word 0x9300 /* data read/write */
- .word 0x0010 /* granularity = 1 (+5th nibble of limit) */
-end_gdt_setup:
projects / karo-tx-uboot.git / blobdiff