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target-ppc: create a helper function to allow more flexible RAM allocation for PPC 4xx 

The 4xx SDRAM controller supports a small number of banks, and each bank must
be one of a small set of sizes. The number of banks and the supported sizes
varies by SoC.

This function uses the user-specified RAM size to fill in the "ram_bases" and
"ram_sizes" arrays required by ppc4xx_sdram_init().

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6063 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aurel32 2008-12-15 23:15:56 +00:00
parent 80e8bd2b0f
commit b7da58fd27
2 changed files with 47 additions and 0 deletions
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5
hw/ppc4xx.h
View File

@ -48,6 +48,11 @@ enum {
qemu_irq *ppcuic_init (CPUState *env, qemu_irq *irqs,
uint32_t dcr_base, int has_ssr, int has_vr);
ram_addr_t ppc4xx_sdram_adjust(ram_addr_t ram_size, int nr_banks,
target_phys_addr_t ram_bases[],
target_phys_addr_t ram_sizes[],
const unsigned int sdram_bank_sizes[]);
void ppc4xx_sdram_init (CPUState *env, qemu_irq irq, int nbanks,
target_phys_addr_t *ram_bases,
target_phys_addr_t *ram_sizes,

42
hw/ppc4xx_devs.c
View File

@ -873,3 +873,45 @@ void ppc4xx_sdram_init (CPUState *env, qemu_irq irq, int nbanks,
sdram_map_bcr(sdram);
}
}
/* Fill in consecutive SDRAM banks with 'ram_size' bytes of memory.
*
* sdram_bank_sizes[] must be 0-terminated.
*
* The 4xx SDRAM controller supports a small number of banks, and each bank
* must be one of a small set of sizes. The number of banks and the supported
* sizes varies by SoC. */
ram_addr_t ppc4xx_sdram_adjust(ram_addr_t ram_size, int nr_banks,
target_phys_addr_t ram_bases[],
target_phys_addr_t ram_sizes[],
const unsigned int sdram_bank_sizes[])
{
ram_addr_t ram_end = 0;
int i;
int j;
for (i = 0; i < nr_banks; i++) {
for (j = 0; sdram_bank_sizes[j] != 0; j++) {
unsigned int bank_size = sdram_bank_sizes[j];
if (bank_size <= ram_size) {
ram_bases[i] = ram_end;
ram_sizes[i] = bank_size;
ram_end += bank_size;
ram_size -= bank_size;
break;
}
}
if (!ram_size) {
/* No need to use the remaining banks. */
break;
}
}
if (ram_size)
printf("Truncating memory to %d MiB to fit SDRAM controller limits.\n",
(int)(ram_end >> 20));
return ram_end;
}