From a1bbaec0cd2a59d4bb09b72e4541a8a12e480d5d Mon Sep 17 00:00:00 2001 From: Nicolas Pitre Date: Tue, 2 Sep 2008 11:44:21 -0400 Subject: [ARM] split highmem into its own memory bank Doing so will greatly simplify the bootmem initialization code as each bank is therefore entirely lowmem or highmem with no crossing between those zones. Signed-off-by: Nicolas Pitre Signed-off-by: Russell King --- arch/arm/mm/mmu.c | 84 +++++++++++++++++++++++++++++++++---------------------- 1 file changed, 51 insertions(+), 33 deletions(-) diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 6870805c31d..ab511d94d91 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -651,44 +651,62 @@ __early_param("vmalloc=", early_vmalloc); #define VMALLOC_MIN (void *)(VMALLOC_END - vmalloc_reserve) -static int __init check_membank_valid(struct membank *mb) -{ - /* - * Check whether this memory region would entirely overlap - * the vmalloc area. - */ - if (phys_to_virt(mb->start) >= VMALLOC_MIN) { - printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx " - "(vmalloc region overlap).\n", - mb->start, mb->start + mb->size - 1); - return 0; - } - - /* - * Check whether this memory region would partially overlap - * the vmalloc area. - */ - if (phys_to_virt(mb->start + mb->size) < phys_to_virt(mb->start) || - phys_to_virt(mb->start + mb->size) > VMALLOC_MIN) { - unsigned long newsize = VMALLOC_MIN - phys_to_virt(mb->start); - - printk(KERN_NOTICE "Truncating RAM at %.8lx-%.8lx " - "to -%.8lx (vmalloc region overlap).\n", - mb->start, mb->start + mb->size - 1, - mb->start + newsize - 1); - mb->size = newsize; - } - - return 1; -} - static void __init sanity_check_meminfo(void) { int i, j; for (i = 0, j = 0; i < meminfo.nr_banks; i++) { - if (check_membank_valid(&meminfo.bank[i])) - meminfo.bank[j++] = meminfo.bank[i]; + struct membank *bank = &meminfo.bank[j]; + *bank = meminfo.bank[i]; + +#ifdef CONFIG_HIGHMEM + /* + * Split those memory banks which are partially overlapping + * the vmalloc area greatly simplifying things later. + */ + if (__va(bank->start) < VMALLOC_MIN && + bank->size > VMALLOC_MIN - __va(bank->start)) { + if (meminfo.nr_banks >= NR_BANKS) { + printk(KERN_CRIT "NR_BANKS too low, " + "ignoring high memory\n"); + } else { + memmove(bank + 1, bank, + (meminfo.nr_banks - i) * sizeof(*bank)); + meminfo.nr_banks++; + i++; + bank[1].size -= VMALLOC_MIN - __va(bank->start); + bank[1].start = __pa(VMALLOC_MIN - 1) + 1; + j++; + } + bank->size = VMALLOC_MIN - __va(bank->start); + } +#else + /* + * Check whether this memory bank would entirely overlap + * the vmalloc area. + */ + if (__va(bank->start) >= VMALLOC_MIN) { + printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx " + "(vmalloc region overlap).\n", + bank->start, bank->start + bank->size - 1); + continue; + } + + /* + * Check whether this memory bank would partially overlap + * the vmalloc area. + */ + if (__va(bank->start + bank->size) > VMALLOC_MIN || + __va(bank->start + bank->size) < __va(bank->start)) { + unsigned long newsize = VMALLOC_MIN - __va(bank->start); + printk(KERN_NOTICE "Truncating RAM at %.8lx-%.8lx " + "to -%.8lx (vmalloc region overlap).\n", + bank->start, bank->start + bank->size - 1, + bank->start + newsize - 1); + bank->size = newsize; + } +#endif + j++; } meminfo.nr_banks = j; } -- cgit v1.2.3