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powerpc: mpc83xx: Enable pre-relocation malloc 

To enable DM on MPC83xx, we need pre-relocation malloc, which is
implemented in this patch.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
[York S: Fixed compiling warning for unused variable 'i']
Reviewed-by: York Sun <york.sun@nxp.com>
This commit is contained in:
mario.six@gdsys.cc 2017-01-17 08:33:48 +01:00 committed by York Sun
parent e80311a5f0
commit dbcb2c0e2b
3 changed files with 25 additions and 7 deletions
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3
arch/powerpc/cpu/mpc83xx/cpu_init.c
View File

@ -205,8 +205,7 @@ void cpu_init_f (volatile immap_t * im)
/* 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 */
memset ((void *) gd, 0, sizeof (gd_t));
/* global data region was cleared in start.S */
/* system performance tweaking */
clrsetbits_be32(&im->arbiter.acr, acr_mask, acr_val);

6
arch/powerpc/cpu/mpc83xx/spl_minimal.c
View File

@ -18,14 +18,10 @@ DECLARE_GLOBAL_DATA_PTR;
*/
void cpu_init_f (volatile immap_t * im)
{
int i;
/* 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 */
for (i = 0; i < sizeof(gd_t); i++)
((char *)gd)[i] = 0;
/* global data region was cleared in start.S */
/* system performance tweaking */

23
arch/powerpc/cpu/mpc83xx/start.S
View File

@ -263,6 +263,29 @@ in_flash:
lis r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@h
ori r3, r3, (CONFIG_SYS_INIT_RAM_ADDR + CONFIG_SYS_GBL_DATA_OFFSET)@l
/* r4 = end of GD area */
addi r4, r3, GENERATED_GBL_DATA_SIZE
/* Zero GD area */
li r0, 0
1:
subi r4, r4, 1
stb r0, 0(r4)
cmplw r3, r4
bne 1b
#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
/* r3 = new stack pointer / pre-reloc malloc area */
subi r3, r3, CONFIG_SYS_MALLOC_F_LEN
/* Set pointer to pre-reloc malloc area in GD */
stw r3, GD_MALLOC_BASE(r4)
#endif
li r0, 0 /* Make room for stack frame header and */
stwu r0, -4(r3) /* clear final stack frame so that */
stwu r0, -4(r3) /* stack backtraces terminate cleanly */