ARM: implement relocation for ixp
Change the implementation for ixp to relocate the code to
an arbitrary address in RAM.
Portions of this work were supported by funding from
the CE Linux Forum.
Signed-off-by: Heiko Schocher <hs@denx.de>
diff --git a/arch/arm/cpu/ixp/start.S b/arch/arm/cpu/ixp/start.S
index 6efe333..b2c8255 100644
--- a/arch/arm/cpu/ixp/start.S
+++ b/arch/arm/cpu/ixp/start.S
@@ -93,12 +93,15 @@
* - jump to second stage
*/
+.globl _TEXT_BASE
_TEXT_BASE:
.word TEXT_BASE
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
.globl _armboot_start
_armboot_start:
.word _start
+#endif
/*
* These are defined in the board-specific linker script.
@@ -123,6 +126,274 @@
.word 0x0badc0de
#endif
+#if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
+/* IRQ stack memory (calculated at run-time) + 8 bytes */
+.globl IRQ_STACK_START_IN
+IRQ_STACK_START_IN:
+ .word 0x0badc0de
+
+.globl _datarel_start
+_datarel_start:
+ .word __datarel_start
+
+.globl _datarelrolocal_start
+_datarelrolocal_start:
+ .word __datarelrolocal_start
+
+.globl _datarellocal_start
+_datarellocal_start:
+ .word __datarellocal_start
+
+.globl _datarelro_start
+_datarelro_start:
+ .word __datarelro_start
+
+.globl _got_start
+_got_start:
+ .word __got_start
+
+.globl _got_end
+_got_end:
+ .word __got_end
+
+/*
+ * the actual reset code
+ */
+
+reset:
+ /* disable mmu, set big-endian */
+ mov r0, #0xf8
+ mcr p15, 0, r0, c1, c0, 0
+ CPWAIT r0
+
+ /* invalidate I & D caches & BTB */
+ mcr p15, 0, r0, c7, c7, 0
+ CPWAIT r0
+
+ /* invalidate I & Data TLB */
+ mcr p15, 0, r0, c8, c7, 0
+ CPWAIT r0
+
+ /* drain write and fill buffers */
+ mcr p15, 0, r0, c7, c10, 4
+ CPWAIT r0
+
+ /* disable write buffer coalescing */
+ mrc p15, 0, r0, c1, c0, 1
+ orr r0, r0, #1
+ mcr p15, 0, r0, c1, c0, 1
+ CPWAIT r0
+
+ /* set EXP CS0 to the optimum timing */
+ ldr r1, =CONFIG_SYS_EXP_CS0
+ ldr r2, =IXP425_EXP_CS0
+ str r1, [r2]
+
+ /* make sure flash is visible at 0 */
+#if 0
+ ldr r2, =IXP425_EXP_CFG0
+ ldr r1, [r2]
+ orr r1, r1, #0x80000000
+ str r1, [r2]
+#endif
+ mov r1, #CONFIG_SYS_SDR_CONFIG
+ ldr r2, =IXP425_SDR_CONFIG
+ str r1, [r2]
+
+ /* disable refresh cycles */
+ mov r1, #0
+ ldr r3, =IXP425_SDR_REFRESH
+ str r1, [r3]
+
+ /* send nop command */
+ mov r1, #3
+ ldr r4, =IXP425_SDR_IR
+ str r1, [r4]
+ DELAY_FOR 0x4000, r0
+
+ /* set SDRAM internal refresh val */
+ ldr r1, =CONFIG_SYS_SDRAM_REFRESH_CNT
+ str r1, [r3]
+ DELAY_FOR 0x4000, r0
+
+ /* send precharge-all command to close all open banks */
+ mov r1, #2
+ str r1, [r4]
+ DELAY_FOR 0x4000, r0
+
+ /* provide 8 auto-refresh cycles */
+ mov r1, #4
+ mov r5, #8
+111: str r1, [r4]
+ DELAY_FOR 0x100, r0
+ subs r5, r5, #1
+ bne 111b
+
+ /* set mode register in sdram */
+ mov r1, #CONFIG_SYS_SDR_MODE_CONFIG
+ str r1, [r4]
+ DELAY_FOR 0x4000, r0
+
+ /* send normal operation command */
+ mov r1, #6
+ str r1, [r4]
+ DELAY_FOR 0x4000, r0
+
+ /* copy */
+ mov r0, #0
+ mov r4, r0
+ add r2, r0, #CONFIG_SYS_MONITOR_LEN
+ mov r1, #0x10000000
+ mov r5, r1
+
+ 30:
+ ldr r3, [r0], #4
+ str r3, [r1], #4
+ cmp r0, r2
+ bne 30b
+
+ /* invalidate I & D caches & BTB */
+ mcr p15, 0, r0, c7, c7, 0
+ CPWAIT r0
+
+ /* invalidate I & Data TLB */
+ mcr p15, 0, r0, c8, c7, 0
+ CPWAIT r0
+
+ /* drain write and fill buffers */
+ mcr p15, 0, r0, c7, c10, 4
+ CPWAIT r0
+
+ /* move flash to 0x50000000 */
+ ldr r2, =IXP425_EXP_CFG0
+ ldr r1, [r2]
+ bic r1, r1, #0x80000000
+ str r1, [r2]
+
+ nop
+ nop
+ nop
+ nop
+ nop
+ nop
+
+ /* invalidate I & Data TLB */
+ mcr p15, 0, r0, c8, c7, 0
+ CPWAIT r0
+
+ /* enable I cache */
+ mrc p15, 0, r0, c1, c0, 0
+ orr r0, r0, #MMU_Control_I
+ mcr p15, 0, r0, c1, c0, 0
+ CPWAIT r0
+
+ mrs r0,cpsr /* set the cpu to SVC32 mode */
+ bic r0,r0,#0x1f /* (superviser mode, M=10011) */
+ orr r0,r0,#0x13
+ msr cpsr,r0
+
+/* Set stackpointer in internal RAM to call board_init_f */
+call_board_init_f:
+ ldr sp, =(CONFIG_SYS_INIT_SP_ADDR)
+ ldr r0,=0x00000000
+ bl board_init_f
+
+/*------------------------------------------------------------------------------*/
+
+/*
+ * void relocate_code (addr_sp, gd, addr_moni)
+ *
+ * This "function" does not return, instead it continues in RAM
+ * after relocating the monitor code.
+ *
+ */
+ .globl relocate_code
+relocate_code:
+ mov r4, r0 /* save addr_sp */
+ mov r5, r1 /* save addr of gd */
+ mov r6, r2 /* save addr of destination */
+ mov r7, r2 /* save addr of destination */
+
+ /* Set up the stack */
+stack_setup:
+ mov sp, r4
+
+ adr r0, _start
+ ldr r2, _TEXT_BASE
+ ldr r3, _bss_start
+ sub r2, r3, r2 /* r2 <- size of armboot */
+ add r2, r0, r2 /* r2 <- source end address */
+ cmp r0, r6
+ beq clear_bss
+
+#ifndef CONFIG_SKIP_RELOCATE_UBOOT
+copy_loop:
+ ldmia r0!, {r9-r10} /* copy from source address [r0] */
+ stmia r6!, {r9-r10} /* copy to target address [r1] */
+ cmp r0, r2 /* until source end addreee [r2] */
+ ble copy_loop
+
+#ifndef CONFIG_PRELOADER
+ /* fix got entries */
+ ldr r1, _TEXT_BASE /* Text base */
+ mov r0, r7 /* reloc addr */
+ ldr r2, _got_start /* addr in Flash */
+ ldr r3, _got_end /* addr in Flash */
+ sub r3, r3, r1
+ add r3, r3, r0
+ sub r2, r2, r1
+ add r2, r2, r0
+
+fixloop:
+ ldr r4, [r2]
+ sub r4, r4, r1
+ add r4, r4, r0
+ str r4, [r2]
+ add r2, r2, #4
+ cmp r2, r3
+ bne fixloop
+#endif
+#endif /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
+
+clear_bss:
+#ifndef CONFIG_PRELOADER
+ ldr r0, _bss_start
+ ldr r1, _bss_end
+ ldr r3, _TEXT_BASE /* Text base */
+ mov r4, r7 /* reloc addr */
+ sub r0, r0, r3
+ add r0, r0, r4
+ sub r1, r1, r3
+ add r1, r1, r4
+ mov r2, #0x00000000 /* clear */
+
+clbss_l:str r2, [r0] /* clear loop... */
+ add r0, r0, #4
+ cmp r0, r1
+ bne clbss_l
+
+ bl coloured_LED_init
+ bl red_LED_on
+#endif
+
+/*
+ * We are done. Do not return, instead branch to second part of board
+ * initialization, now running from RAM.
+ */
+ ldr r0, _TEXT_BASE
+ ldr r2, _board_init_r
+ sub r2, r2, r0
+ add r2, r2, r7 /* position from board_init_r in RAM */
+ /* setup parameters for board_init_r */
+ mov r0, r5 /* gd_t */
+ mov r1, r7 /* dest_addr */
+ /* jump to it ... */
+ mov lr, r2
+ mov pc, lr
+
+_board_init_r: .word board_init_r
+
+#else /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
/****************************************************************************/
/* */
/* the actual reset code */
@@ -304,6 +575,7 @@
ldr pc, _start_armboot
_start_armboot: .word start_armboot
+#endif /* #if !defined(CONFIG_SYS_ARM_WITHOUT_RELOC) */
/****************************************************************************/
@@ -345,9 +617,13 @@
stmia sp, {r0 - r12} /* Calling r0-r12 */
add r8, sp, #S_PC
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
ldr r2, _armboot_start
sub r2, r2, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
sub r2, r2, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ set base 2 words into abort stack
+#else
+ ldr r2, IRQ_STACK_START_IN
+#endif
ldmia r2, {r2 - r4} /* get pc, cpsr, old_r0 */
add r0, sp, #S_FRAME_SIZE /* restore sp_SVC */
@@ -382,9 +658,13 @@
.endm
.macro get_bad_stack
+#if defined(CONFIG_SYS_ARM_WITHOUT_RELOC)
ldr r13, _armboot_start @ setup our mode stack
sub r13, r13, #(CONFIG_STACKSIZE+CONFIG_SYS_MALLOC_LEN)
sub r13, r13, #(CONFIG_SYS_GBL_DATA_SIZE+8) @ reserved a couple spots in abort stack
+#else
+ ldr r13, IRQ_STACK_START_IN @ setup our mode stack
+#endif
str lr, [r13] @ save caller lr / spsr
mrs lr, spsr
diff --git a/arch/arm/cpu/ixp/u-boot.lds b/arch/arm/cpu/ixp/u-boot.lds
index b8ff2ee..f3d9dc5 100644
--- a/arch/arm/cpu/ixp/u-boot.lds
+++ b/arch/arm/cpu/ixp/u-boot.lds
@@ -39,11 +39,23 @@
.rodata : { *(SORT_BY_ALIGNMENT(SORT_BY_NAME(.rodata*))) }
. = ALIGN(4);
- .data : { *(.data) }
+ .data : {
+ *(.data)
+ __datarel_start = .;
+ *(.data.rel)
+ __datarelrolocal_start = .;
+ *(.data.rel.ro.local)
+ __datarellocal_start = .;
+ *(.data.rel.local)
+ __datarelro_start = .;
+ *(.data.rel.ro)
+ }
+ __got_start = .;
. = ALIGN(4);
.got : { *(.got) }
+ __got_end = .;
. = .;
__u_boot_cmd_start = .;
.u_boot_cmd : { *(.u_boot_cmd) }