diff options
author | Vineet Gupta <vgupta@synopsys.com> | 2015-10-28 18:48:17 +0530 |
---|---|---|
committer | Vineet Gupta <vgupta@synopsys.com> | 2015-10-28 19:49:00 +0530 |
commit | 6101be5ad439806c70b54bdd083e7db9e3affb3d (patch) | |
tree | 4d950167134bbffa8a4cefebc97b3b5a4a48fec6 /arch/arc/mm/init.c | |
parent | 336e2136e1353db8e9e731c27381ee0735656a8a (diff) |
ARC: mm: preps ahead of HIGHMEM support #2
Explicit'ify that all memory added so far is low memory
Nothing semantical
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'arch/arc/mm/init.c')
-rw-r--r-- | arch/arc/mm/init.c | 40 |
1 files changed, 14 insertions, 26 deletions
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c index 5121b9b16ba8..a726a229baf6 100644 --- a/arch/arc/mm/init.c +++ b/arch/arc/mm/init.c @@ -24,16 +24,16 @@ pgd_t swapper_pg_dir[PTRS_PER_PGD] __aligned(PAGE_SIZE); char empty_zero_page[PAGE_SIZE] __aligned(PAGE_SIZE); EXPORT_SYMBOL(empty_zero_page); -/* Default tot mem from .config */ -static unsigned long arc_mem_sz = 0x20000000; /* some default */ +static const unsigned long low_mem_start = CONFIG_LINUX_LINK_BASE; +static unsigned long low_mem_sz; /* User can over-ride above with "mem=nnn[KkMm]" in cmdline */ static int __init setup_mem_sz(char *str) { - arc_mem_sz = memparse(str, NULL) & PAGE_MASK; + low_mem_sz = memparse(str, NULL) & PAGE_MASK; /* early console might not be setup yet - it will show up later */ - pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(arc_mem_sz)); + pr_info("\"mem=%s\": mem sz set to %ldM\n", str, TO_MB(low_mem_sz)); return 0; } @@ -41,10 +41,10 @@ early_param("mem", setup_mem_sz); void __init early_init_dt_add_memory_arch(u64 base, u64 size) { - arc_mem_sz = size & PAGE_MASK; - pr_info("Memory size set via devicetree %ldM\n", TO_MB(arc_mem_sz)); + low_mem_sz = size; + BUG_ON(base != low_mem_start); - BUG_ON(base != CONFIG_LINUX_LINK_BASE); + pr_info("Memory @ %llx of %ldM\n", base, TO_MB(size)); } #ifdef CONFIG_BLK_DEV_INITRD @@ -74,46 +74,34 @@ early_param("initrd", early_initrd); void __init setup_arch_memory(void) { unsigned long zones_size[MAX_NR_ZONES]; - unsigned long end_mem = CONFIG_LINUX_LINK_BASE + arc_mem_sz; init_mm.start_code = (unsigned long)_text; init_mm.end_code = (unsigned long)_etext; init_mm.end_data = (unsigned long)_edata; init_mm.brk = (unsigned long)_end; - /* - * We do it here, so that memory is correctly instantiated - * even if "mem=xxx" cmline over-ride is given and/or - * DT has memory node. Each causes an update to @arc_mem_sz - * and we finally add memory one here - */ - memblock_add(CONFIG_LINUX_LINK_BASE, arc_mem_sz); - - /*------------- externs in mm need setting up ---------------*/ - /* first page of system - kernel .vector starts here */ min_low_pfn = ARCH_PFN_OFFSET; - /* Last usable page of low mem (no HIGHMEM yet for ARC port) */ - max_low_pfn = max_pfn = PFN_DOWN(end_mem); + /* Last usable page of low mem */ + max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz); max_mapnr = max_low_pfn - min_low_pfn; - /*------------- reserve kernel image -----------------------*/ - memblock_reserve(CONFIG_LINUX_LINK_BASE, - __pa(_end) - CONFIG_LINUX_LINK_BASE); + /*------------- bootmem allocator setup -----------------------*/ + memblock_add(low_mem_start, low_mem_sz); + memblock_reserve(low_mem_start, __pa(_end) - low_mem_start); #ifdef CONFIG_BLK_DEV_INITRD - /*------------- reserve initrd image -----------------------*/ if (initrd_start) memblock_reserve(__pa(initrd_start), initrd_end - initrd_start); #endif memblock_dump_all(); - /*-------------- node setup --------------------------------*/ + /*----------------- node/zones setup --------------------------*/ memset(zones_size, 0, sizeof(zones_size)); - zones_size[ZONE_NORMAL] = max_mapnr; + zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn; /* * We can't use the helper free_area_init(zones[]) because it uses |