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sparc32: beautify srmmu_inherit_prom_mappings() 

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Sam Ravnborg 2012-07-26 11:02:15 +00:00 committed by David S. Miller
parent f71a2aacc6
commit 7cdfbc74c8
1 changed files with 16 additions and 10 deletions
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26
arch/sparc/mm/srmmu.c
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@ -677,44 +677,48 @@ static inline unsigned long srmmu_probe(unsigned long vaddr)
static void __init srmmu_inherit_prom_mappings(unsigned long start,
unsigned long end)
{
unsigned long probed;
unsigned long addr;
pgd_t *pgdp;
pmd_t *pmdp;
pte_t *ptep;
int what = 0; /* 0 = normal-pte, 1 = pmd-level pte, 2 = pgd-level pte */
unsigned long prompte;
int what; /* 0 = normal-pte, 1 = pmd-level pte, 2 = pgd-level pte */
while (start <= end) {
if (start == 0)
break; /* probably wrap around */
if (start == 0xfef00000)
start = KADB_DEBUGGER_BEGVM;
if (!(prompte = srmmu_probe(start))) {
probed = srmmu_probe(start);
if (!probed) {
/* continue probing until we find an entry */
start += PAGE_SIZE;
continue;
}
/* A red snapper, see what it really is. */
what = 0;
addr = start - PAGE_SIZE;
if (!(start & ~(SRMMU_REAL_PMD_MASK))) {
if (srmmu_probe((start - PAGE_SIZE) + SRMMU_REAL_PMD_SIZE) == prompte)
if (srmmu_probe(addr + SRMMU_REAL_PMD_SIZE) == probed)
what = 1;
}
if (!(start & ~(SRMMU_PGDIR_MASK))) {
if (srmmu_probe((start-PAGE_SIZE) + SRMMU_PGDIR_SIZE) ==
prompte)
if (srmmu_probe(addr + SRMMU_PGDIR_SIZE) == probed)
what = 2;
}
pgdp = pgd_offset_k(start);
if (what == 2) {
*(pgd_t *)__nocache_fix(pgdp) = __pgd(prompte);
*(pgd_t *)__nocache_fix(pgdp) = __pgd(probed);
start += SRMMU_PGDIR_SIZE;
continue;
}
if (pgd_none(*(pgd_t *)__nocache_fix(pgdp))) {
pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE);
pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE,
SRMMU_PMD_TABLE_SIZE);
if (pmdp == NULL)
early_pgtable_allocfail("pmd");
memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE);
@ -734,13 +738,15 @@ static void __init srmmu_inherit_prom_mappings(unsigned long start,
* good hardware PTE piece. Alternatives seem worse.
*/
unsigned int x; /* Index of HW PMD in soft cluster */
unsigned long *val;
x = (start >> PMD_SHIFT) & 15;
*(unsigned long *)__nocache_fix(&pmdp->pmdv[x]) = prompte;
val = &pmdp->pmdv[x];
*(unsigned long *)__nocache_fix(val) = probed;
start += SRMMU_REAL_PMD_SIZE;
continue;
}
ptep = pte_offset_kernel(__nocache_fix(pmdp), start);
*(pte_t *)__nocache_fix(ptep) = __pte(prompte);
*(pte_t *)__nocache_fix(ptep) = __pte(probed);
start += PAGE_SIZE;
}
}