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powerpc: mpc85xx: Enable pre-relocation malloc for MPC85xx

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To enable DM on MPC85xx, we need pre-relocation malloc, which is
implemented in this patch.

We also make sure that the IVORs are always 4-aligned on e500 to prevent
alignment exceptions caused by code changes in start.S.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Cc: York Sun <york.sun@nxp.com>
Cc: Simon Glass <sjg@chromium.org>
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
mario.six@gdsys.cc 2016-04-05 15:05:37 +02:00 committed by York Sun
parent b39d1213e3
commit 5068946120
3 changed files with 35 additions and 7 deletions
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9
arch/powerpc/cpu/mpc85xx/cpu_init_early.c
View file

@ -82,7 +82,6 @@ void setup_ifc(void)
void cpu_init_early_f(void *fdt)
{
u32 mas0, mas1, mas2, mas3, mas7;
int i;
#ifdef CONFIG_SYS_FSL_ERRATUM_P1010_A003549
ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR);
#endif
@ -90,17 +89,13 @@ void cpu_init_early_f(void *fdt)
ccsr_l2cache_t *l2cache = (void *)CONFIG_SYS_MPC85xx_L2_ADDR;
u32 *dst, *src;
void (*setup_ifc_sram)(void);
int i;
#endif
/* Pointer is writable since we allocated a register for it */
gd = (gd_t *) (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET);
/*
* Clear initial global data
* we don't use memset so we can share this code with NAND_SPL
*/
for (i = 0; i < sizeof(gd_t); i++)
((char *)gd)[i] = 0;
/* gd area was zeroed during startup */
#ifdef CONFIG_QEMU_E500
/*

30
arch/powerpc/cpu/mpc85xx/start.S
View file

@ -1152,6 +1152,36 @@ _start_cont:
/* Setup the stack in initial RAM,could be L2-as-SRAM or L1 dcache*/
lis r3,(CONFIG_SYS_INIT_RAM_ADDR)@h
ori r3,r3,((CONFIG_SYS_INIT_SP_OFFSET-16)&~0xf)@l /* Align to 16 */
#ifdef CONFIG_SYS_MALLOC_F_LEN
#if CONFIG_SYS_MALLOC_F_LEN + GENERATED_GBL_DATA_SIZE > CONFIG_SYS_INIT_RAM_SIZE
#error "CONFIG_SYS_MALLOC_F_LEN too large to fit into initial RAM."
#endif
/* Leave 16+ byte for back chain termination and NULL return address */
subi r3,r3,((CONFIG_SYS_MALLOC_F_LEN+16+15)&~0xf)
#endif
/* End of RAM */
lis r4,(CONFIG_SYS_INIT_RAM_ADDR)@h
ori r4,r4,(CONFIG_SYS_INIT_RAM_SIZE)@l
li r0,0
1: subi r4,r4,4
stw r0,0(r4)
cmplw r4,r3
bne 1b
#ifdef CONFIG_SYS_MALLOC_F_LEN
lis r4,(CONFIG_SYS_INIT_RAM_ADDR)@h
ori r4,r4,(CONFIG_SYS_GBL_DATA_OFFSET)@l
addi r3,r3,16 /* Pre-relocation malloc area */
stw r3,GD_MALLOC_BASE(r4)
subi r3,r3,16
#endif
li r0,0
stw r0,0(r3) /* Terminate Back Chain */
stw r0,+4(r3) /* NULL return address. */

3
include/ppc_asm.tmpl
View file

@ -263,12 +263,14 @@
b transfer_to_handler
#define STD_EXCEPTION(n, label, hdlr) \
.align 4; \
label: \
EXCEPTION_PROLOG(SRR0, SRR1); \
addi r3,r1,STACK_FRAME_OVERHEAD; \
EXC_XFER_TEMPLATE(n, label, hdlr, MSR_KERNEL, NOCOPY) \
#define CRIT_EXCEPTION(n, label, hdlr) \
.align 4; \
label: \
EXCEPTION_PROLOG(CSRR0, CSRR1); \
addi r3,r1,STACK_FRAME_OVERHEAD; \
@ -276,6 +278,7 @@ label: \
MSR_KERNEL & ~(MSR_ME|MSR_DE|MSR_CE), NOCOPY) \
#define MCK_EXCEPTION(n, label, hdlr) \
.align 4; \
label: \
EXCEPTION_PROLOG(MCSRR0, MCSRR1); \
addi r3,r1,STACK_FRAME_OVERHEAD; \