Reworked the LEON3 start.S code to call board_init_f function at startup. Also implemented the relocate_code function in assembly to relocate the monitor and setup the stack pointer before calling relocated board_init_r.
Add the CONFIG_SYS_GENERIC_BOARD variable to all the LEON3 boards.
Signed-off-by: Francois Retief fgretief@spaceteq.co.za ---
arch/sparc/cpu/leon3/cpu_init.c | 11 -- arch/sparc/cpu/leon3/start.S | 248 ++++++++++++++++++++++----------------- include/configs/gr_cpci_ax2000.h | 2 + include/configs/gr_ep2s60.h | 2 + include/configs/gr_xc3s_1500.h | 2 + include/configs/grsim.h | 2 + 6 files changed, 151 insertions(+), 116 deletions(-)
diff --git a/arch/sparc/cpu/leon3/cpu_init.c b/arch/sparc/cpu/leon3/cpu_init.c index 0ce2f89..9c76657 100644 --- a/arch/sparc/cpu/leon3/cpu_init.c +++ b/arch/sparc/cpu/leon3/cpu_init.c @@ -47,17 +47,6 @@ void cpu_init_f(void) #endif }
-/* Routine called from start.S, - * - * Run from FLASH/PROM: - * - memory controller has already been setup up, stack can be used - * - global variables available for read/writing - * - constants avaiable - */ -void cpu_init_f2(void) -{ -} - /* If cache snooping is available in hardware the result will be set * to 0x800000, otherwise 0. */ diff --git a/arch/sparc/cpu/leon3/start.S b/arch/sparc/cpu/leon3/start.S index 1988ee1..52e82b5 100644 --- a/arch/sparc/cpu/leon3/start.S +++ b/arch/sparc/cpu/leon3/start.S @@ -257,11 +257,18 @@ wiminit: set WIM_INIT, %g3 mov %g3, %wim
-stackp: +stackinit: set CONFIG_SYS_INIT_SP_OFFSET, %fp andn %fp, 0x0f, %fp sub %fp, 64, %sp
+tbrinit: + set CONFIG_SYS_TEXT_BASE, %g2 + wr %g0, %g2, %tbr + nop + nop + nop + /* Obtain the address of _GLOBAL_OFFSET_TABLE_ */ SPARC_PIC_THUNK_CALL(l7)
@@ -298,25 +305,50 @@ cpu_init_unreloc: call cpu_init_f nop
-/* un relocated start address of monitor */ -#define TEXT_START _text +board_init_unreloc: + call board_init_f + clr %o0 ! boot_flags + +dead_unreloc: + mov 1, %g1 ! For GRMON2 to exit normally. + ta 0 ! If board_init_f call returns.. (unlikely) + nop + nop + ba dead_unreloc ! infinte loop + nop
-/* un relocated end address of monitor */ -#define DATA_END __init_end +!-------------------------------------------------------------------------------
+/* void relocate_code (addr_sp, gd, addr_moni) + * + * This "function" does not return, instead it continues in RAM after + * relocating the monitor code. + * + * %o0 = Relocated stack pointer + * %o1 = Relocated global data pointer + * %o2 = Relocated text pointer + * + * %l7 = _GLOBAL_OFFSET_TABLE_ address + */ + .globl relocate_code + .type relocate_code, #function + .align 4 +relocate_code: + !SPARC_PIC_THUNK_CALL(l7) reloc: - SPARC_LOAD_ADDRESS(TEXT_START, l7, g2) - SPARC_LOAD_ADDRESS(DATA_END, l7, g3) - set CONFIG_SYS_RELOC_MONITOR_BASE,%g4 -reloc_loop: - ldd [%g2],%l0 - ldd [%g2+8],%l2 - std %l0,[%g4] - std %l2,[%g4+8] - inc 16,%g2 - subcc %g3,%g2,%g0 - bne reloc_loop - inc 16,%g4 + SPARC_LOAD_ADDRESS(_text, l7, g2) ! start address of monitor + SPARC_LOAD_ADDRESS(__init_end, l7, g3) ! end address of monitor + mov %o2, %g4 ! relocation address + sub %g4, %g2, %g6 ! relocation offset + /* copy .text & .data to relocated address */ +10: ldd [%g2], %l0 + ldd [%g2+8], %l2 + std %l0, [%g4] + std %l2, [%g4+8] + inc 16, %g2 ! src += 16 + cmp %g2, %g3 + bcs 10b ! while (src < end) + inc 16, %g4 ! dst += 16
clr %l0 clr %l1 @@ -331,49 +363,42 @@ reloc_loop: * */
+ /* clear the relocated .bss area */ clr_bss: -/* clear bss area (the relocated) */ SPARC_LOAD_ADDRESS(__bss_start, l7, g2) SPARC_LOAD_ADDRESS(__bss_end, l7, g3) - sub %g3,%g2,%g3 + sub %g3,%g2,%g3 ! length of .bss area add %g3,%g4,%g3 + /* clearing 16byte a time ==> linker script need to align to 16 byte offset */ clr %g1 /* std %g0 uses g0 and g1 */ -/* clearing 16byte a time ==> linker script need to align to 16 byte offset */ -clr_bss_16: - std %g0,[%g4] - std %g0,[%g4+8] - inc 16,%g4 - cmp %g3,%g4 - bne clr_bss_16 +20: + std %g0, [%g4] + std %g0, [%g4+8] + inc 16, %g4 ! ptr += 16 + cmp %g4, %g3 + bcs 20b ! while (ptr < end) nop
-/* add offsets to GOT table */ + /* add offsets to GOT table */ fixup_got: SPARC_LOAD_ADDRESS(__got_start, l7, g4) + add %g4, %g6, %g4 SPARC_LOAD_ADDRESS(__got_end, l7, g3) -/* - * new got offset = (old GOT-PTR (read with ld) - - * CONFIG_SYS_RELOC_MONITOR_BASE(from define) ) + - * Destination Address (from define) - */ - set CONFIG_SYS_RELOC_MONITOR_BASE,%g2 - SPARC_LOAD_ADDRESS(TEXT_START, l7, g1) - add %g4,%g2,%g4 - sub %g4,%g1,%g4 - add %g3,%g2,%g3 - sub %g3,%g1,%g3 - sub %g2,%g1,%g2 ! prepare register with (new base address) - - ! (old base address) -got_loop: - ld [%g4],%l0 ! load old GOT-PTR - add %l0,%g2,%l0 ! increase with (new base address) - - ! (old base) - st %l0,[%g4] - inc 4,%g4 - cmp %g3,%g4 - bne got_loop + add %g3, %g6, %g3 +30: ld [%g4], %l0 +#ifdef CONFIG_RELOC_GOT_SKIP_NULL + cmp %l0, 0 + be 32f +#endif + add %l0, %g6, %l0 ! relocate GOT pointer + st %l0, [%g4] +32: inc 4, %g4 ! ptr += 4 + cmp %g4, %g3 + bcs 30b ! while (ptr < end) nop
+#if 0 /* FIXME: Relocated PROM address should be calculated! */ + prom_relocate: SPARC_LOAD_ADDRESS(__prom_start, l7, g2) SPARC_LOAD_ADDRESS(__prom_end, l7, g3) @@ -389,35 +414,46 @@ prom_relocate_loop: bne prom_relocate_loop inc 16,%g4
+#endif + +! %o0 = stack pointer (relocated) +! %o1 = global data pointer (relocated) +! %o2 = text pointer (relocated) + +! %g6 = relocation offset +! %l7 = _GLOBAL_OFFSET_TABLE_ + /* Trap table has been moved, lets tell CPU about * the new trap table address */ - - set CONFIG_SYS_RELOC_MONITOR_BASE, %g2 - wr %g0, %g2, %tbr +update_trap_table_address: + wr %g0, %o2, %tbr nop nop nop
-/* Call relocated init functions */ -jump: - SPARC_LOAD_ADDRESS(cpu_init_f2, l7, o1) - set CONFIG_SYS_RELOC_MONITOR_BASE,%o2 - add %o1,%o2,%o1 - sub %o1,%g1,%o1 - call %o1 - clr %o0 +update_stack_pointers: + mov %o0, %fp + andn %fp, 0x0f, %fp ! align to 16 bytes + add %fp, -64, %fp ! make space for a window push + mov %fp, %sp ! setup stack pointer + +jump_board_init_r: + mov %o1, %o0 ! relocated global data pointer + mov %o2, %o1 ! relocated text pointer + SPARC_LOAD_ADDRESS(board_init_r, l7, o3) + add %o3, %g6, %o3 ! add relocation offset + call %o3 + nop
- SPARC_LOAD_ADDRESS(board_init_f, l7, o1) - set CONFIG_SYS_RELOC_MONITOR_BASE,%o2 - SPARC_LOAD_ADDRESS(TEXT_START, l7, g1) - add %o1,%o2,%o1 - sub %o1,%g1,%o1 - call %o1 - clr %o0 +dead: + mov 1, %g1 ! For GRMON2 to exit normally. + ta 0 ! if call returns.. (unlikely) + nop + b dead ! infinte loop + nop
-dead: ta 0 ! if call returns... - nop +!------------------------------------------------------------------------------
/* Interrupt handler caller, * reg L7: interrupt number @@ -446,54 +482,56 @@ _irq_entry:
RESTORE_ALL
-!Window overflow trap handler. +!------------------------------------------------------------------------------ + +/* + * Window overflow trap handler + */ .global _window_overflow
_window_overflow:
mov %wim, %l3 ! Calculate next WIM - mov %g1, %l7 - srl %l3, 1, %g1 - sll %l3, (CONFIG_SYS_SPARC_NWINDOWS-1) , %l4 - or %l4, %g1, %g1 - + mov %g1, %l7 + srl %l3, 1, %g1 + sll %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l4 + or %g1, %l4, %g1 save ! Get into window to be saved. - mov %g1, %wim - nop; - nop; - nop - st %l0, [%sp + 0]; - st %l1, [%sp + 4]; - st %l2, [%sp + 8]; - st %l3, [%sp + 12]; - st %l4, [%sp + 16]; - st %l5, [%sp + 20]; - st %l6, [%sp + 24]; - st %l7, [%sp + 28]; - st %i0, [%sp + 32]; - st %i1, [%sp + 36]; - st %i2, [%sp + 40]; - st %i3, [%sp + 44]; - st %i4, [%sp + 48]; - st %i5, [%sp + 52]; - st %i6, [%sp + 56]; - st %i7, [%sp + 60]; + mov %g1, %wim + nop; nop; nop + st %l0, [%sp + 0] ! Save window to the stack + st %l1, [%sp + 4] + st %l2, [%sp + 8] + st %l3, [%sp + 12] + st %l4, [%sp + 16] + st %l5, [%sp + 20] + st %l6, [%sp + 24] + st %l7, [%sp + 28] + st %i0, [%sp + 32] + st %i1, [%sp + 36] + st %i2, [%sp + 40] + st %i3, [%sp + 44] + st %i4, [%sp + 48] + st %i5, [%sp + 52] + st %i6, [%sp + 56] + st %i7, [%sp + 60] restore ! Go back to trap window. - mov %l7, %g1 + mov %l7, %g1 jmp %l1 ! Re-execute save. - rett %l2 - -/* Window underflow trap handler. */ + rett %l2
+/* + * Window underflow trap handler + */ .global _window_underflow
_window_underflow:
- mov %wim, %l3 ! Calculate next WIM - sll %l3, 1, %l4 - srl %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l5 - or %l5, %l4, %l5 - mov %l5, %wim + mov %wim, %l3 ! Calculate next WIM + srl %l3, (CONFIG_SYS_SPARC_NWINDOWS-1), %l5 + sll %l3, 1, %l4 + or %l5, %l4, %l5 + mov %l5, %wim nop; nop; nop restore ! Two restores to get into the restore ! window to restore @@ -516,9 +554,9 @@ _window_underflow: save ! Get back to the trap window. save jmp %l1 ! Re-execute restore. - rett %l2 + rett %l2
- retl +!------------------------------------------------------------------------------
_nmi_trap: nop diff --git a/include/configs/gr_cpci_ax2000.h b/include/configs/gr_cpci_ax2000.h index 67538d0..a16f59a 100644 --- a/include/configs/gr_cpci_ax2000.h +++ b/include/configs/gr_cpci_ax2000.h @@ -14,6 +14,8 @@ #ifndef __CONFIG_H__ #define __CONFIG_H__
+#define CONFIG_SYS_GENERIC_BOARD + /* * High Level Configuration Options * (easy to change) diff --git a/include/configs/gr_ep2s60.h b/include/configs/gr_ep2s60.h index 387596d..f472179 100644 --- a/include/configs/gr_ep2s60.h +++ b/include/configs/gr_ep2s60.h @@ -15,6 +15,8 @@ #ifndef __CONFIG_H__ #define __CONFIG_H__
+#define CONFIG_SYS_GENERIC_BOARD + /* * High Level Configuration Options * (easy to change) diff --git a/include/configs/gr_xc3s_1500.h b/include/configs/gr_xc3s_1500.h index 5fb800b..8598ac1 100644 --- a/include/configs/gr_xc3s_1500.h +++ b/include/configs/gr_xc3s_1500.h @@ -13,6 +13,8 @@ #ifndef __CONFIG_H__ #define __CONFIG_H__
+#define CONFIG_SYS_GENERIC_BOARD + /* * High Level Configuration Options * (easy to change) diff --git a/include/configs/grsim.h b/include/configs/grsim.h index 932f330..e280dee 100644 --- a/include/configs/grsim.h +++ b/include/configs/grsim.h @@ -13,6 +13,8 @@ #ifndef __CONFIG_H__ #define __CONFIG_H__
+#define CONFIG_SYS_GENERIC_BOARD + /* * High Level Configuration Options * (easy to change)