diff options
Diffstat (limited to 'mm/early_ioremap.c')
| -rw-r--r-- | mm/early_ioremap.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c index 0cfadafb3fb0..23f744d77ce0 100644 --- a/mm/early_ioremap.c +++ b/mm/early_ioremap.c @@ -224,6 +224,28 @@ early_memremap_ro(resource_size_t phys_addr, unsigned long size) return (__force void *)__early_ioremap(phys_addr, size, FIXMAP_PAGE_RO); } #endif + +#define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT) + +void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size) +{ + unsigned long slop, clen; + char *p; + + while (size) { + slop = src & ~PAGE_MASK; + clen = size; + if (clen > MAX_MAP_CHUNK - slop) + clen = MAX_MAP_CHUNK - slop; + p = early_memremap(src & PAGE_MASK, clen + slop); + memcpy(dest, p + slop, clen); + early_memunmap(p, clen + slop); + dest += clen; + src += clen; + size -= clen; + } +} + #else /* CONFIG_MMU */ void __init __iomem * |