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sparc: leon3: Updates for generic board initialization 

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>
This commit is contained in:
Francois Retief 2015-10-29 00:02:48 +02:00
parent cb31eaa4b3
commit a62bba15b5
6 changed files with 151 additions and 116 deletions
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11
arch/sparc/cpu/leon3/cpu_init.c
View File

@ -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.
*/

248
arch/sparc/cpu/leon3/start.S
View File

@ -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
/* un relocated end address of monitor */
#define DATA_END __init_end
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
!-------------------------------------------------------------------------------
/* 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
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
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
dead: ta 0 ! if call returns...
nop
dead:
mov 1, %g1 ! For GRMON2 to exit normally.
ta 0 ! if call returns.. (unlikely)
nop
b dead ! infinte loop
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

2
include/configs/gr_cpci_ax2000.h
View File

@ -14,6 +14,8 @@
#ifndef __CONFIG_H__
#define __CONFIG_H__
#define CONFIG_SYS_GENERIC_BOARD
/*
* High Level Configuration Options
* (easy to change)

2
include/configs/gr_ep2s60.h
View File

@ -15,6 +15,8 @@
#ifndef __CONFIG_H__
#define __CONFIG_H__
#define CONFIG_SYS_GENERIC_BOARD
/*
* High Level Configuration Options
* (easy to change)

2
include/configs/gr_xc3s_1500.h
View File

@ -13,6 +13,8 @@
#ifndef __CONFIG_H__
#define __CONFIG_H__
#define CONFIG_SYS_GENERIC_BOARD
/*
* High Level Configuration Options
* (easy to change)

2
include/configs/grsim.h
View File

@ -13,6 +13,8 @@
#ifndef __CONFIG_H__
#define __CONFIG_H__
#define CONFIG_SYS_GENERIC_BOARD
/*
* High Level Configuration Options
* (easy to change)