/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1995 Linus Torvalds * Copyright (C) 1995 Waldorf Electronics * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle * Copyright (C) 1996 Stoned Elipot * Copyright (C) 1999 Silicon Graphics, Inc. * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki */#include <linux/config.h>#include <linux/errno.h>#include <linux/init.h>#include <linux/ioport.h>#include <linux/sched.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/module.h>#include <linux/stddef.h>#include <linux/string.h>#include <linux/unistd.h>#include <linux/slab.h>#include <linux/user.h>#include <linux/utsname.h>#include <linux/a.out.h>#include <linux/tty.h>#include <linux/bootmem.h>#include <linux/initrd.h>#include <linux/major.h>#include <linux/kdev_t.h>#include <linux/root_dev.h>#include <linux/highmem.h>#include <linux/console.h>#include <linux/mmzone.h>#include <linux/pfn.h> #include <asm/addrspace.h>#include <asm/bootinfo.h>#include <asm/cache.h>#include <asm/cpu.h>#include <asm/sections.h>#include <asm/setup.h>#include <asm/system.h> struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; EXPORT_SYMBOL(cpu_data); #ifdef CONFIG_VTstruct screen_info screen_info;#endif /* * Despite it's name this variable is even if we don't have PCI */unsigned int PCI_DMA_BUS_IS_PHYS; EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); /* * Setup information * * These are initialized so they are in the .data section */unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN; EXPORT_SYMBOL(mips_machtype);EXPORT_SYMBOL(mips_machgroup); struct boot_mem_map boot_mem_map; static char command_line[CL_SIZE]; char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; /* * mips_io_port_base is the begin of the address space to which x86 style * I/O ports are mapped. */const unsigned long mips_io_port_base __read_mostly = -1;EXPORT_SYMBOL(mips_io_port_base); /* * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped * for the processor. */unsigned long isa_slot_offset;EXPORT_SYMBOL(isa_slot_offset); static struct resource code_resource = { .name = "Kernel code", };static struct resource data_resource = { .name = "Kernel data", }; void __init add_memory_region(phys_t start, phys_t size, long type){ int x = boot_mem_map.nr_map; struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; /* * Try to merge with previous entry if any. This is far less than * perfect but is sufficient for most real world cases. */ if (x && prev->addr + prev->size == start && prev->type == type) { prev->size += size; return; } if (x == BOOT_MEM_MAP_MAX) { printk("Ooops! Too many entries in the memory map!\n"); return; } boot_mem_map.map[x].addr = start; boot_mem_map.map[x].size = size; boot_mem_map.map[x].type = type; boot_mem_map.nr_map++;} static void __init print_memory_map(void){ int i; const int field = 2 * sizeof(unsigned long); for (i = 0; i < boot_mem_map.nr_map; i++) { printk(" memory: %0*Lx @ %0*Lx ", field, (unsigned long long) boot_mem_map.map[i].size, field, (unsigned long long) boot_mem_map.map[i].addr); switch (boot_mem_map.map[i].type) { case BOOT_MEM_RAM: printk("(usable)\n"); break; case BOOT_MEM_ROM_DATA: printk("(ROM data)\n"); break; case BOOT_MEM_RESERVED: printk("(reserved)\n"); break; default: printk("type %lu\n", boot_mem_map.map[i].type); break; } }} static inline void parse_cmdline_early(void){ char c = ' ', *to = command_line, *from = saved_command_line; unsigned long start_at, mem_size; int len = 0; int usermem = 0; printk("Determined physical RAM map:\n"); print_memory_map(); for (;;) { /* * "mem=XXX[kKmM]" defines a memory region from * 0 to <XXX>, overriding the determined size. * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from * <YYY> to <YYY>+<XXX>, overriding the determined size. */ if (c == ' ' && !memcmp(from, "mem=", 4)) { if (to != command_line) to--; /* * If a user specifies memory size, we * blow away any automatically generated * size. */ if (usermem == 0) { boot_mem_map.nr_map = 0; usermem = 1; } mem_size = memparse(from + 4, &from); if (*from == '@') start_at = memparse(from + 1, &from); else start_at = 0; add_memory_region(start_at, mem_size, BOOT_MEM_RAM); } c = *(from++); if (!c) break; if (CL_SIZE <= ++len) break; *(to++) = c; } *to = '\0'; if (usermem) { printk("User-defined physical RAM map:\n"); print_memory_map(); }} static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end){ /* * "rd_start=0xNNNNNNNN" defines the memory address of an initrd * "rd_size=0xNN" it's size */ unsigned long start = 0; unsigned long size = 0; unsigned long end; char cmd_line[CL_SIZE]; char *start_str; char *size_str; char *tmp; strcpy(cmd_line, command_line); *command_line = 0; tmp = cmd_line; /* Ignore "rd_start=" strings in other parameters. */ start_str = strstr(cmd_line, "rd_start="); if (start_str && start_str != cmd_line && *(start_str - 1) != ' ') start_str = strstr(start_str, " rd_start="); while (start_str) { if (start_str != cmd_line) strncat(command_line, tmp, start_str - tmp); start = memparse(start_str + 9, &start_str); tmp = start_str + 1; start_str = strstr(start_str, " rd_start="); } if (*tmp) strcat(command_line, tmp); strcpy(cmd_line, command_line); *command_line = 0; tmp = cmd_line; /* Ignore "rd_size" strings in other parameters. */ size_str = strstr(cmd_line, "rd_size="); if (size_str && size_str != cmd_line && *(size_str - 1) != ' ') size_str = strstr(size_str, " rd_size="); while (size_str) { if (size_str != cmd_line) strncat(command_line, tmp, size_str - tmp); size = memparse(size_str + 8, &size_str); tmp = size_str + 1; size_str = strstr(size_str, " rd_size="); } if (*tmp) strcat(command_line, tmp); #ifdef CONFIG_64BIT /* HACK: Guess if the sign extension was forgotten */ if (start > 0x0000000080000000 && start < 0x00000000ffffffff) start |= 0xffffffff00000000UL;#endif end = start + size; if (start && end) { *rd_start = start; *rd_end = end; return 1; } return 0;} #define MAXMEM HIGHMEM_START#define MAXMEM_PFN PFN_DOWN(MAXMEM) static inline void bootmem_init(void){ unsigned long start_pfn; unsigned long reserved_end = (unsigned long)&_end;#ifndef CONFIG_SGI_IP27 unsigned long first_usable_pfn; unsigned long bootmap_size; int i;#endif#ifdef CONFIG_BLK_DEV_INITRD int initrd_reserve_bootmem = 0; /* Board specific code should have set up initrd_start and initrd_end */ ROOT_DEV = Root_RAM0; if (parse_rd_cmdline(&initrd_start, &initrd_end)) { reserved_end = max(reserved_end, initrd_end); initrd_reserve_bootmem = 1; } else { unsigned long tmp; u32 *initrd_header; tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2; if (tmp < reserved_end) tmp += PAGE_SIZE; initrd_header = (u32 *)tmp; if (initrd_header[0] == 0x494E5244) { initrd_start = (unsigned long)&initrd_header[2]; initrd_end = initrd_start + initrd_header[1]; reserved_end = max(reserved_end, initrd_end); initrd_reserve_bootmem = 1; } }#endif /* CONFIG_BLK_DEV_INITRD */ /* * Partially used pages are not usable - thus * we are rounding upwards. */ start_pfn = PFN_UP(CPHYSADDR(reserved_end)); #ifndef CONFIG_SGI_IP27 /* Find the highest page frame number we have available. */ max_pfn = 0; first_usable_pfn = -1UL; for (i = 0; i < boot_mem_map.nr_map; i++) { unsigned long start, end; if (boot_mem_map.map[i].type != BOOT_MEM_RAM) continue; start = PFN_UP(boot_mem_map.map[i].addr); end = PFN_DOWN(boot_mem_map.map[i].addr + boot_mem_map.map[i].size); if (start >= end) continue; if (end > max_pfn) max_pfn = end; if (start < first_usable_pfn) { if (start > start_pfn) { first_usable_pfn = start; } else if (end > start_pfn) { first_usable_pfn = start_pfn; } } } /* * Determine low and high memory ranges */ max_low_pfn = max_pfn; if (max_low_pfn > MAXMEM_PFN) { max_low_pfn = MAXMEM_PFN;#ifndef CONFIG_HIGHMEM /* Maximum memory usable is what is directly addressable */ printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM >> 20); printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");#endif } #ifdef CONFIG_HIGHMEM /* * Crude, we really should make a better attempt at detecting * highstart_pfn */ highstart_pfn = highend_pfn = max_pfn; if (max_pfn > MAXMEM_PFN) { highstart_pfn = MAXMEM_PFN; printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT)); }#endif /* Initialize the boot-time allocator with low memory only. */ bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn); /* * Register fully available low RAM pages with the bootmem allocator. */ for (i = 0; i < boot_mem_map.nr_map; i++) { unsigned long curr_pfn, last_pfn, size; /* * Reserve usable memory. */ if (boot_mem_map.map[i].type != BOOT_MEM_RAM) continue; /* * We are rounding up the start address of usable memory: */ curr_pfn = PFN_UP(boot_mem_map.map[i].addr); if (curr_pfn >= max_low_pfn) continue; if (curr_pfn < start_pfn) curr_pfn = start_pfn; /* * ... and at the end of the usable range downwards: */ last_pfn = PFN_DOWN(boot_mem_map.map[i].addr + boot_mem_map.map[i].size); if (last_pfn > max_low_pfn) last_pfn = max_low_pfn; /* * Only register lowmem part of lowmem segment with bootmem. */ size = last_pfn - curr_pfn; if (curr_pfn > PFN_DOWN(HIGHMEM_START)) continue; if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START)) size = PFN_DOWN(HIGHMEM_START) - curr_pfn; if (!size) continue; /* * ... finally, did all the rounding and playing * around just make the area go away? */ if (last_pfn <= curr_pfn) continue; /* Register lowmem ranges */ free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); memory_present(0, curr_pfn, curr_pfn + size - 1); } /* Reserve the bootmap memory. */ reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);#endif /* CONFIG_SGI_IP27 */ #ifdef CONFIG_BLK_DEV_INITRD initrd_below_start_ok = 1; if (initrd_start) { unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start); const int width = sizeof(long) * 2; printk("Initial ramdisk at: 0x%p (%lu bytes)\n", (void *)initrd_start, initrd_size); if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) { printk("initrd extends beyond end of memory " "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n", width, (unsigned long long) CPHYSADDR(initrd_end), width, (unsigned long long) PFN_PHYS(max_low_pfn)); initrd_start = initrd_end = 0; initrd_reserve_bootmem = 0; } if (initrd_reserve_bootmem) reserve_bootmem(CPHYSADDR(initrd_start), initrd_size); }#endif /* CONFIG_BLK_DEV_INITRD */} /* * arch_mem_init - initialize memory managment subsystem * * o plat_mem_setup() detects the memory configuration and will record detected * memory areas using add_memory_region. * o parse_cmdline_early() parses the command line for mem= options which, * iff detected, will override the results of the automatic detection. * * At this stage the memory configuration of the system is known to the * kernel but generic memory managment system is still entirely uninitialized. * * o bootmem_init() * o sparse_init() * o paging_init() * * At this stage the bootmem allocator is ready to use. * * NOTE: historically plat_mem_setup did the entire platform initialization. * This was rather impractical because it meant plat_mem_setup had to * get away without any kind of memory allocator. To keep old code from * breaking plat_setup was just renamed to plat_setup and a second platform * initialization hook for anything else was introduced. */ extern void plat_mem_setup(void); static void __init arch_mem_init(char **cmdline_p){ /* call board setup routine */ plat_mem_setup(); strlcpy(command_line, arcs_cmdline, sizeof(command_line)); strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line; parse_cmdline_early(); bootmem_init(); sparse_init(); paging_init();} static inline void resource_init(void){ int i; code_resource.start = virt_to_phys(&_text); code_resource.end = virt_to_phys(&_etext) - 1; data_resource.start = virt_to_phys(&_etext); data_resource.end = virt_to_phys(&_edata) - 1; /* * Request address space for all standard RAM. */ for (i = 0; i < boot_mem_map.nr_map; i++) { struct resource *res;Lines 1–500 of 581. Load more
/* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Copyright (C) 1995 Linus Torvalds * Copyright (C) 1995 Waldorf Electronics * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03 Ralf Baechle * Copyright (C) 1996 Stoned Elipot * Copyright (C) 1999 Silicon Graphics, Inc. * Copyright (C) 2000 2001, 2002 Maciej W. Rozycki */ #include <linux/config.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/module.h> #include <linux/stddef.h> #include <linux/string.h> #include <linux/unistd.h> #include <linux/slab.h> #include <linux/user.h> #include <linux/utsname.h> #include <linux/a.out.h> #include <linux/tty.h> #include <linux/bootmem.h> #include <linux/initrd.h> #include <linux/major.h> #include <linux/kdev_t.h> #include <linux/root_dev.h> #include <linux/highmem.h> #include <linux/console.h> #include <linux/mmzone.h> #include <linux/pfn.h> #include <asm/addrspace.h> #include <asm/bootinfo.h> #include <asm/cache.h> #include <asm/cpu.h> #include <asm/sections.h> #include <asm/setup.h> #include <asm/system.h> struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; EXPORT_SYMBOL(cpu_data); #ifdef CONFIG_VT struct screen_info screen_info; #endif /* * Despite it's name this variable is even if we don't have PCI */ unsigned int PCI_DMA_BUS_IS_PHYS; EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS); /* * Setup information * * These are initialized so they are in the .data section */ unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; unsigned long mips_machgroup __read_mostly = MACH_GROUP_UNKNOWN; EXPORT_SYMBOL(mips_machtype); EXPORT_SYMBOL(mips_machgroup); struct boot_mem_map boot_mem_map; static char command_line[CL_SIZE]; char arcs_cmdline[CL_SIZE]=CONFIG_CMDLINE; /* * mips_io_port_base is the begin of the address space to which x86 style * I/O ports are mapped. */ const unsigned long mips_io_port_base __read_mostly = -1; EXPORT_SYMBOL(mips_io_port_base); /* * isa_slot_offset is the address where E(ISA) busaddress 0 is mapped * for the processor. */ unsigned long isa_slot_offset; EXPORT_SYMBOL(isa_slot_offset); static struct resource code_resource = { .name = "Kernel code", }; static struct resource data_resource = { .name = "Kernel data", }; void __init add_memory_region(phys_t start, phys_t size, long type) { int x = boot_mem_map.nr_map; struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1; /* * Try to merge with previous entry if any. This is far less than * perfect but is sufficient for most real world cases. */ if (x && prev->addr + prev->size == start && prev->type == type) { prev->size += size; return; } if (x == BOOT_MEM_MAP_MAX) { printk("Ooops! Too many entries in the memory map!\n"); return; } boot_mem_map.map[x].addr = start; boot_mem_map.map[x].size = size; boot_mem_map.map[x].type = type; boot_mem_map.nr_map++; } static void __init print_memory_map(void) { int i; const int field = 2 * sizeof(unsigned long); for (i = 0; i < boot_mem_map.nr_map; i++) { printk(" memory: %0*Lx @ %0*Lx ", field, (unsigned long long) boot_mem_map.map[i].size, field, (unsigned long long) boot_mem_map.map[i].addr); switch (boot_mem_map.map[i].type) { case BOOT_MEM_RAM: printk("(usable)\n"); break; case BOOT_MEM_ROM_DATA: printk("(ROM data)\n"); break; case BOOT_MEM_RESERVED: printk("(reserved)\n"); break; default: printk("type %lu\n", boot_mem_map.map[i].type); break; } } } static inline void parse_cmdline_early(void) { char c = ' ', *to = command_line, *from = saved_command_line; unsigned long start_at, mem_size; int len = 0; int usermem = 0; printk("Determined physical RAM map:\n"); print_memory_map(); for (;;) { /* * "mem=XXX[kKmM]" defines a memory region from * 0 to <XXX>, overriding the determined size. * "mem=XXX[KkmM]@YYY[KkmM]" defines a memory region from * <YYY> to <YYY>+<XXX>, overriding the determined size. */ if (c == ' ' && !memcmp(from, "mem=", 4)) { if (to != command_line) to--; /* * If a user specifies memory size, we * blow away any automatically generated * size. */ if (usermem == 0) { boot_mem_map.nr_map = 0; usermem = 1; } mem_size = memparse(from + 4, &from); if (*from == '@') start_at = memparse(from + 1, &from); else start_at = 0; add_memory_region(start_at, mem_size, BOOT_MEM_RAM); } c = *(from++); if (!c) break; if (CL_SIZE <= ++len) break; *(to++) = c; } *to = '\0'; if (usermem) { printk("User-defined physical RAM map:\n"); print_memory_map(); } } static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_end) { /* * "rd_start=0xNNNNNNNN" defines the memory address of an initrd * "rd_size=0xNN" it's size */ unsigned long start = 0; unsigned long size = 0; unsigned long end; char cmd_line[CL_SIZE]; char *start_str; char *size_str; char *tmp; strcpy(cmd_line, command_line); *command_line = 0; tmp = cmd_line; /* Ignore "rd_start=" strings in other parameters. */ start_str = strstr(cmd_line, "rd_start="); if (start_str && start_str != cmd_line && *(start_str - 1) != ' ') start_str = strstr(start_str, " rd_start="); while (start_str) { if (start_str != cmd_line) strncat(command_line, tmp, start_str - tmp); start = memparse(start_str + 9, &start_str); tmp = start_str + 1; start_str = strstr(start_str, " rd_start="); } if (*tmp) strcat(command_line, tmp); strcpy(cmd_line, command_line); *command_line = 0; tmp = cmd_line; /* Ignore "rd_size" strings in other parameters. */ size_str = strstr(cmd_line, "rd_size="); if (size_str && size_str != cmd_line && *(size_str - 1) != ' ') size_str = strstr(size_str, " rd_size="); while (size_str) { if (size_str != cmd_line) strncat(command_line, tmp, size_str - tmp); size = memparse(size_str + 8, &size_str); tmp = size_str + 1; size_str = strstr(size_str, " rd_size="); } if (*tmp) strcat(command_line, tmp); #ifdef CONFIG_64BIT /* HACK: Guess if the sign extension was forgotten */ if (start > 0x0000000080000000 && start < 0x00000000ffffffff) start |= 0xffffffff00000000UL; #endif end = start + size; if (start && end) { *rd_start = start; *rd_end = end; return 1; } return 0; } #define MAXMEM HIGHMEM_START #define MAXMEM_PFN PFN_DOWN(MAXMEM) static inline void bootmem_init(void) { unsigned long start_pfn; unsigned long reserved_end = (unsigned long)&_end; #ifndef CONFIG_SGI_IP27 unsigned long first_usable_pfn; unsigned long bootmap_size; int i; #endif #ifdef CONFIG_BLK_DEV_INITRD int initrd_reserve_bootmem = 0; /* Board specific code should have set up initrd_start and initrd_end */ ROOT_DEV = Root_RAM0; if (parse_rd_cmdline(&initrd_start, &initrd_end)) { reserved_end = max(reserved_end, initrd_end); initrd_reserve_bootmem = 1; } else { unsigned long tmp; u32 *initrd_header; tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2; if (tmp < reserved_end) tmp += PAGE_SIZE; initrd_header = (u32 *)tmp; if (initrd_header[0] == 0x494E5244) { initrd_start = (unsigned long)&initrd_header[2]; initrd_end = initrd_start + initrd_header[1]; reserved_end = max(reserved_end, initrd_end); initrd_reserve_bootmem = 1; } } #endif /* CONFIG_BLK_DEV_INITRD */ /* * Partially used pages are not usable - thus * we are rounding upwards. */ start_pfn = PFN_UP(CPHYSADDR(reserved_end)); #ifndef CONFIG_SGI_IP27 /* Find the highest page frame number we have available. */ max_pfn = 0; first_usable_pfn = -1UL; for (i = 0; i < boot_mem_map.nr_map; i++) { unsigned long start, end; if (boot_mem_map.map[i].type != BOOT_MEM_RAM) continue; start = PFN_UP(boot_mem_map.map[i].addr); end = PFN_DOWN(boot_mem_map.map[i].addr + boot_mem_map.map[i].size); if (start >= end) continue; if (end > max_pfn) max_pfn = end; if (start < first_usable_pfn) { if (start > start_pfn) { first_usable_pfn = start; } else if (end > start_pfn) { first_usable_pfn = start_pfn; } } } /* * Determine low and high memory ranges */ max_low_pfn = max_pfn; if (max_low_pfn > MAXMEM_PFN) { max_low_pfn = MAXMEM_PFN; #ifndef CONFIG_HIGHMEM /* Maximum memory usable is what is directly addressable */ printk(KERN_WARNING "Warning only %ldMB will be used.\n", MAXMEM >> 20); printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n"); #endif } #ifdef CONFIG_HIGHMEM /* * Crude, we really should make a better attempt at detecting * highstart_pfn */ highstart_pfn = highend_pfn = max_pfn; if (max_pfn > MAXMEM_PFN) { highstart_pfn = MAXMEM_PFN; printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", (highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT)); } #endif /* Initialize the boot-time allocator with low memory only. */ bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn); /* * Register fully available low RAM pages with the bootmem allocator. */ for (i = 0; i < boot_mem_map.nr_map; i++) { unsigned long curr_pfn, last_pfn, size; /* * Reserve usable memory. */ if (boot_mem_map.map[i].type != BOOT_MEM_RAM) continue; /* * We are rounding up the start address of usable memory: */ curr_pfn = PFN_UP(boot_mem_map.map[i].addr); if (curr_pfn >= max_low_pfn) continue; if (curr_pfn < start_pfn) curr_pfn = start_pfn; /* * ... and at the end of the usable range downwards: */ last_pfn = PFN_DOWN(boot_mem_map.map[i].addr + boot_mem_map.map[i].size); if (last_pfn > max_low_pfn) last_pfn = max_low_pfn; /* * Only register lowmem part of lowmem segment with bootmem. */ size = last_pfn - curr_pfn; if (curr_pfn > PFN_DOWN(HIGHMEM_START)) continue; if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START)) size = PFN_DOWN(HIGHMEM_START) - curr_pfn; if (!size) continue; /* * ... finally, did all the rounding and playing * around just make the area go away? */ if (last_pfn <= curr_pfn) continue; /* Register lowmem ranges */ free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size)); memory_present(0, curr_pfn, curr_pfn + size - 1); } /* Reserve the bootmap memory. */ reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size); #endif /* CONFIG_SGI_IP27 */ #ifdef CONFIG_BLK_DEV_INITRD initrd_below_start_ok = 1; if (initrd_start) { unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start); const int width = sizeof(long) * 2; printk("Initial ramdisk at: 0x%p (%lu bytes)\n", (void *)initrd_start, initrd_size); if (CPHYSADDR(initrd_end) > PFN_PHYS(max_low_pfn)) { printk("initrd extends beyond end of memory " "(0x%0*Lx > 0x%0*Lx)\ndisabling initrd\n", width, (unsigned long long) CPHYSADDR(initrd_end), width, (unsigned long long) PFN_PHYS(max_low_pfn)); initrd_start = initrd_end = 0; initrd_reserve_bootmem = 0; } if (initrd_reserve_bootmem) reserve_bootmem(CPHYSADDR(initrd_start), initrd_size); } #endif /* CONFIG_BLK_DEV_INITRD */ } /* * arch_mem_init - initialize memory managment subsystem * * o plat_mem_setup() detects the memory configuration and will record detected * memory areas using add_memory_region. * o parse_cmdline_early() parses the command line for mem= options which, * iff detected, will override the results of the automatic detection. * * At this stage the memory configuration of the system is known to the * kernel but generic memory managment system is still entirely uninitialized. * * o bootmem_init() * o sparse_init() * o paging_init() * * At this stage the bootmem allocator is ready to use. * * NOTE: historically plat_mem_setup did the entire platform initialization. * This was rather impractical because it meant plat_mem_setup had to * get away without any kind of memory allocator. To keep old code from * breaking plat_setup was just renamed to plat_setup and a second platform * initialization hook for anything else was introduced. */ extern void plat_mem_setup(void); static void __init arch_mem_init(char **cmdline_p) { /* call board setup routine */ plat_mem_setup(); strlcpy(command_line, arcs_cmdline, sizeof(command_line)); strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE); *cmdline_p = command_line; parse_cmdline_early(); bootmem_init(); sparse_init(); paging_init(); } static inline void resource_init(void) { int i; code_resource.start = virt_to_phys(&_text); code_resource.end = virt_to_phys(&_etext) - 1; data_resource.start = virt_to_phys(&_etext); data_resource.end = virt_to_phys(&_edata) - 1; /* * Request address space for all standard RAM. */ for (i = 0; i < boot_mem_map.nr_map; i++) { struct resource *res;