diff options
Diffstat (limited to 'arch/sh/mm/init.c')
| -rw-r--r-- | arch/sh/mm/init.c | 173 |
1 files changed, 169 insertions, 4 deletions
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c index c505de61a5ca..46f84de62469 100644 --- a/arch/sh/mm/init.c +++ b/arch/sh/mm/init.c @@ -2,7 +2,7 @@ * linux/arch/sh/mm/init.c * * Copyright (C) 1999 Niibe Yutaka - * Copyright (C) 2002 - 2007 Paul Mundt + * Copyright (C) 2002 - 2010 Paul Mundt * * Based on linux/arch/i386/mm/init.c: * Copyright (C) 1995 Linus Torvalds @@ -16,17 +16,31 @@ #include <linux/pagemap.h> #include <linux/percpu.h> #include <linux/io.h> +#include <linux/lmb.h> #include <linux/dma-mapping.h> #include <asm/mmu_context.h> +#include <asm/mmzone.h> +#include <asm/kexec.h> #include <asm/tlb.h> #include <asm/cacheflush.h> #include <asm/sections.h> +#include <asm/setup.h> #include <asm/cache.h> #include <asm/sizes.h> DEFINE_PER_CPU(struct mmu_gather, mmu_gathers); pgd_t swapper_pg_dir[PTRS_PER_PGD]; +void __init generic_mem_init(void) +{ + lmb_add(__MEMORY_START, __MEMORY_SIZE); +} + +void __init __weak plat_mem_setup(void) +{ + /* Nothing to see here, move along. */ +} + #ifdef CONFIG_MMU static pte_t *__get_pte_phys(unsigned long addr) { @@ -152,15 +166,166 @@ void __init page_table_range_init(unsigned long start, unsigned long end, } #endif /* CONFIG_MMU */ -/* - * paging_init() sets up the page tables - */ +void __init allocate_pgdat(unsigned int nid) +{ + unsigned long start_pfn, end_pfn; +#ifdef CONFIG_NEED_MULTIPLE_NODES + unsigned long phys; +#endif + + get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); + +#ifdef CONFIG_NEED_MULTIPLE_NODES + phys = __lmb_alloc_base(sizeof(struct pglist_data), + SMP_CACHE_BYTES, end_pfn << PAGE_SHIFT); + /* Retry with all of system memory */ + if (!phys) + phys = __lmb_alloc_base(sizeof(struct pglist_data), + SMP_CACHE_BYTES, lmb_end_of_DRAM()); + if (!phys) + panic("Can't allocate pgdat for node %d\n", nid); + + NODE_DATA(nid) = __va(phys); + memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); + + NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; +#endif + + NODE_DATA(nid)->node_start_pfn = start_pfn; + NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn; +} + +static void __init bootmem_init_one_node(unsigned int nid) +{ + unsigned long total_pages, paddr; + unsigned long end_pfn; + struct pglist_data *p; + int i; + + p = NODE_DATA(nid); + + /* Nothing to do.. */ + if (!p->node_spanned_pages) + return; + + end_pfn = p->node_start_pfn + p->node_spanned_pages; + + total_pages = bootmem_bootmap_pages(p->node_spanned_pages); + + paddr = lmb_alloc(total_pages << PAGE_SHIFT, PAGE_SIZE); + if (!paddr) + panic("Can't allocate bootmap for nid[%d]\n", nid); + + init_bootmem_node(p, paddr >> PAGE_SHIFT, p->node_start_pfn, end_pfn); + + free_bootmem_with_active_regions(nid, end_pfn); + + /* + * XXX Handle initial reservations for the system memory node + * only for the moment, we'll refactor this later for handling + * reservations in other nodes. + */ + if (nid == 0) { + /* Reserve the sections we're already using. */ + for (i = 0; i < lmb.reserved.cnt; i++) + reserve_bootmem(lmb.reserved.region[i].base, + lmb_size_bytes(&lmb.reserved, i), + BOOTMEM_DEFAULT); + } + + sparse_memory_present_with_active_regions(nid); +} + +static void __init do_init_bootmem(void) +{ + int i; + + /* Add active regions with valid PFNs. */ + for (i = 0; i < lmb.memory.cnt; i++) { + unsigned long start_pfn, end_pfn; + start_pfn = lmb.memory.region[i].base >> PAGE_SHIFT; + end_pfn = start_pfn + lmb_size_pages(&lmb.memory, i); + __add_active_range(0, start_pfn, end_pfn); + } + + /* All of system RAM sits in node 0 for the non-NUMA case */ + allocate_pgdat(0); + node_set_online(0); + + plat_mem_setup(); + + for_each_online_node(i) + bootmem_init_one_node(i); + + sparse_init(); +} + +static void __init early_reserve_mem(void) +{ + unsigned long start_pfn; + + /* + * Partially used pages are not usable - thus + * we are rounding upwards: + */ + start_pfn = PFN_UP(__pa(_end)); + + /* + * Reserve the kernel text and Reserve the bootmem bitmap. We do + * this in two steps (first step was init_bootmem()), because + * this catches the (definitely buggy) case of us accidentally + * initializing the bootmem allocator with an invalid RAM area. + */ + lmb_reserve(__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET, + (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - + (__MEMORY_START + CONFIG_ZERO_PAGE_OFFSET)); + + /* + * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET. + */ + if (CONFIG_ZERO_PAGE_OFFSET != 0) + lmb_reserve(__MEMORY_START, CONFIG_ZERO_PAGE_OFFSET); + + /* + * Handle additional early reservations + */ + check_for_initrd(); + reserve_crashkernel(); +} + void __init paging_init(void) { unsigned long max_zone_pfns[MAX_NR_ZONES]; unsigned long vaddr, end; int nid; + lmb_init(); + + sh_mv.mv_mem_init(); + + early_reserve_mem(); + + lmb_enforce_memory_limit(memory_limit); + lmb_analyze(); + + lmb_dump_all(); + + /* + * Determine low and high memory ranges: + */ + max_low_pfn = max_pfn = lmb_end_of_DRAM() >> PAGE_SHIFT; + min_low_pfn = __MEMORY_START >> PAGE_SHIFT; + + nodes_clear(node_online_map); + + memory_start = (unsigned long)__va(__MEMORY_START); + memory_end = memory_start + (memory_limit ?: lmb_phys_mem_size()); + + uncached_init(); + pmb_init(); + do_init_bootmem(); + ioremap_fixed_init(); + /* We don't need to map the kernel through the TLB, as * it is permanatly mapped using P1. So clear the * entire pgd. */ |