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powerpc: Move default hash table size calculation to hash_utils_64.c

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We weren't computing the size of the hash table correctly on iSeries
because the relevant code in prom.c was #ifdef CONFIG_PPC_PSERIES.
This moves the code to hash_utils_64.c, makes it unconditional, and
cleans it up a bit.

Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Paul Mackerras
2005-10-12 16:58:53 +10:00
parent b6ec995a21
commit 3eac8c69d1
2 changed files with 22 additions and 21 deletions
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23
arch/powerpc/mm/hash_utils_64.c
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@@ -155,6 +155,27 @@ static inline void create_pte_mapping(unsigned long start, unsigned long end,
}
}
static unsigned long get_hashtable_size(void)
{
unsigned long rnd_mem_size, pteg_count;
/* If hash size wasn't obtained in prom.c, we calculate it now based on
* the total RAM size
*/
if (ppc64_pft_size)
return 1UL << ppc64_pft_size;
/* round mem_size up to next power of 2 */
rnd_mem_size = 1UL << __ilog2(systemcfg->physicalMemorySize);
if (rnd_mem_size < systemcfg->physicalMemorySize)
rnd_mem_size <<= 1;
/* # pages / 2 */
pteg_count = max(rnd_mem_size >> (12 + 1), 1UL << 11);
return pteg_count << 7;
}
void __init htab_initialize(void)
{
unsigned long table, htab_size_bytes;
@@ -170,7 +191,7 @@ void __init htab_initialize(void)
* Calculate the required size of the htab. We want the number of
* PTEGs to equal one half the number of real pages.
*/
htab_size_bytes = 1UL << ppc64_pft_size;
htab_size_bytes = get_hashtable_size();
pteg_count = htab_size_bytes >> 7;
/* For debug, make the HTAB 1/8 as big as it normally would be. */