diff options
| -rw-r--r-- | include/asm-generic/early_ioremap.h | 6 | ||||
| -rw-r--r-- | mm/early_ioremap.c | 22 |
2 files changed, 28 insertions, 0 deletions
diff --git a/include/asm-generic/early_ioremap.h b/include/asm-generic/early_ioremap.h index a5de55c04fb2..e539f27ec51b 100644 --- a/include/asm-generic/early_ioremap.h +++ b/include/asm-generic/early_ioremap.h @@ -33,6 +33,12 @@ extern void early_ioremap_setup(void); */ extern void early_ioremap_reset(void); +/* + * Early copy from unmapped memory to kernel mapped memory. + */ +extern void copy_from_early_mem(void *dest, phys_addr_t src, + unsigned long size); + #else static inline void early_ioremap_init(void) { } static inline void early_ioremap_setup(void) { } diff --git a/mm/early_ioremap.c b/mm/early_ioremap.c index e10ccd299d66..a0baeb4be934 100644 --- a/mm/early_ioremap.c +++ b/mm/early_ioremap.c @@ -217,6 +217,28 @@ early_memremap(resource_size_t phys_addr, unsigned long size) return (__force void *)__early_ioremap(phys_addr, size, FIXMAP_PAGE_NORMAL); } + +#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 * |