* 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/screen_info.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/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];
+struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
EXPORT_SYMBOL(cpu_data);
EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
-extern void * __rd_start, * __rd_end;
-
/*
* Setup information
*
* These are initialized so they are in the .data section
*/
-unsigned long mips_machtype = MACH_UNKNOWN;
-unsigned long mips_machgroup = MACH_GROUP_UNKNOWN;
+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);
* 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 = -1;
+const unsigned long mips_io_port_base __read_mostly = -1;
EXPORT_SYMBOL(mips_io_port_base);
/*
unsigned long isa_slot_offset;
EXPORT_SYMBOL(isa_slot_offset);
-static struct resource code_resource = { "Kernel code" };
-static struct resource data_resource = { "Kernel data" };
+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;
+ /* Sanity check */
+ if (start + size < start) {
+ printk("Trying to add an invalid memory region, skipped\n");
+ return;
+ }
+
/*
* Try to merge with previous entry if any. This is far less than
* perfect but is sufficient for most real world cases.
}
}
-static inline void parse_cmdline_early(void)
+/*
+ * Manage initrd
+ */
+#ifdef CONFIG_BLK_DEV_INITRD
+
+static int __init rd_start_early(char *p)
{
- char c = ' ', *to = command_line, *from = saved_command_line;
- unsigned long start_at, mem_size;
- int len = 0;
- int usermem = 0;
+ unsigned long start = memparse(p, &p);
- printk("Determined physical RAM map:\n");
- print_memory_map();
+#ifdef CONFIG_64BIT
+ /* Guess if the sign extension was forgotten by bootloader */
+ if (start < XKPHYS)
+ start = (int)start;
+#endif
+ initrd_start = start;
+ initrd_end += start;
+ return 0;
+}
+early_param("rd_start", rd_start_early);
- 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;
+static int __init rd_size_early(char *p)
+{
+ initrd_end += memparse(p, &p);
+ return 0;
+}
+early_param("rd_size", rd_size_early);
+
+/* it returns the next free pfn after initrd */
+static unsigned long __init init_initrd(void)
+{
+ unsigned long end;
+ u32 *initrd_header;
+
+ /*
+ * Board specific code or command line parser should have
+ * already set up initrd_start and initrd_end. In these cases
+ * perfom sanity checks and use them if all looks good.
+ */
+ if (initrd_start && initrd_end > initrd_start)
+ goto sanitize;
+
+ /*
+ * See if initrd has been added to the kernel image by
+ * arch/mips/boot/addinitrd.c. In that case a header is
+ * prepended to initrd and is made up by 8 bytes. The fisrt
+ * word is a magic number and the second one is the size of
+ * initrd. Initrd start must be page aligned in any cases.
+ */
+ initrd_header = __va(PAGE_ALIGN(__pa_symbol(&_end) + 8)) - 8;
+ if (initrd_header[0] != 0x494E5244)
+ goto disable;
+ initrd_start = (unsigned long)(initrd_header + 2);
+ initrd_end = initrd_start + initrd_header[1];
+
+sanitize:
+ if (initrd_start & ~PAGE_MASK) {
+ printk(KERN_ERR "initrd start must be page aligned\n");
+ goto disable;
+ }
+ if (initrd_start < PAGE_OFFSET) {
+ printk(KERN_ERR "initrd start < PAGE_OFFSET\n");
+ goto disable;
}
- *to = '\0';
- if (usermem) {
- printk("User-defined physical RAM map:\n");
- print_memory_map();
+ /*
+ * Sanitize initrd addresses. For example firmware
+ * can't guess if they need to pass them through
+ * 64-bits values if the kernel has been built in pure
+ * 32-bit. We need also to switch from KSEG0 to XKPHYS
+ * addresses now, so the code can now safely use __pa().
+ */
+ end = __pa(initrd_end);
+ initrd_end = (unsigned long)__va(end);
+ initrd_start = (unsigned long)__va(__pa(initrd_start));
+
+ ROOT_DEV = Root_RAM0;
+ return PFN_UP(end);
+disable:
+ initrd_start = 0;
+ initrd_end = 0;
+ return 0;
+}
+
+static void __init finalize_initrd(void)
+{
+ unsigned long size = initrd_end - initrd_start;
+
+ if (size == 0) {
+ printk(KERN_INFO "Initrd not found or empty");
+ goto disable;
}
+ if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
+ printk("Initrd extends beyond end of memory");
+ goto disable;
+ }
+
+ reserve_bootmem(__pa(initrd_start), size);
+ initrd_below_start_ok = 1;
+
+ printk(KERN_INFO "Initial ramdisk at: 0x%lx (%lu bytes)\n",
+ initrd_start, size);
+ return;
+disable:
+ printk(" - disabling initrd\n");
+ initrd_start = 0;
+ initrd_end = 0;
}
+#else /* !CONFIG_BLK_DEV_INITRD */
+
+static unsigned long __init init_initrd(void)
+{
+ return 0;
+}
-#define PFN_UP(x) (((x) + PAGE_SIZE - 1) >> PAGE_SHIFT)
-#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
+#define finalize_initrd() do {} while (0)
-#define MAXMEM HIGHMEM_START
-#define MAXMEM_PFN PFN_DOWN(MAXMEM)
+#endif
-static inline void bootmem_init(void)
+/*
+ * Initialize the bootmem allocator. It also setup initrd related data
+ * if needed.
+ */
+#ifdef CONFIG_SGI_IP27
+
+static void __init bootmem_init(void)
{
- unsigned long start_pfn;
-#ifndef CONFIG_SGI_IP27
- unsigned long bootmap_size, max_low_pfn, first_usable_pfn;
+ init_initrd();
+ finalize_initrd();
+}
+
+#else /* !CONFIG_SGI_IP27 */
+
+static void __init bootmem_init(void)
+{
+ unsigned long reserved_end;
+ unsigned long highest = 0;
+ unsigned long mapstart = -1UL;
+ unsigned long bootmap_size;
int i;
-#endif
-#ifdef CONFIG_BLK_DEV_INITRD
- unsigned long tmp;
- unsigned long *initrd_header;
-
- tmp = (((unsigned long)&_end + PAGE_SIZE-1) & PAGE_MASK) - 8;
- if (tmp < (unsigned long)&_end)
- tmp += PAGE_SIZE;
- initrd_header = (unsigned long *)tmp;
- if (initrd_header[0] == 0x494E5244) {
- initrd_start = (unsigned long)&initrd_header[2];
- initrd_end = initrd_start + initrd_header[1];
- }
- start_pfn = PFN_UP(CPHYSADDR((&_end)+(initrd_end - initrd_start) + PAGE_SIZE));
-#else
+
/*
- * Partially used pages are not usable - thus
- * we are rounding upwards.
+ * Init any data related to initrd. It's a nop if INITRD is
+ * not selected. Once that done we can determine the low bound
+ * of usable memory.
*/
- start_pfn = PFN_UP(CPHYSADDR(&_end));
-#endif /* CONFIG_BLK_DEV_INITRD */
+ reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));
-#ifndef CONFIG_SGI_IP27
- /* Find the highest page frame number we have available. */
- max_pfn = 0;
- first_usable_pfn = -1UL;
+ /*
+ * Find the highest page frame number we have available.
+ */
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
start = PFN_UP(boot_mem_map.map[i].addr);
end = PFN_DOWN(boot_mem_map.map[i].addr
- + boot_mem_map.map[i].size);
+ + boot_mem_map.map[i].size);
- if (start >= end)
+ if (end > highest)
+ highest = end;
+ if (end <= reserved_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;
- }
- }
+ if (start >= mapstart)
+ continue;
+ mapstart = max(reserved_end, start);
}
/*
* 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");
+ if (highest > PFN_DOWN(HIGHMEM_START)) {
+#ifdef CONFIG_HIGHMEM
+ highstart_pfn = PFN_DOWN(HIGHMEM_START);
+ highend_pfn = highest;
#endif
+ highest = PFN_DOWN(HIGHMEM_START);
}
-#ifdef CONFIG_HIGHMEM
/*
- * Crude, we really should make a better attempt at detecting
- * highstart_pfn
+ * Initialize the boot-time allocator with low memory only.
*/
- 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);
+ bootmap_size = init_bootmem(mapstart, highest);
/*
* 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;
+ unsigned long start, end, 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
+ 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 (last_pfn > max_low_pfn)
- last_pfn = max_low_pfn;
-
/*
- * Only register lowmem part of lowmem segment with bootmem.
+ * We are rounding up the start address of usable memory
+ * and at the end of the usable range downwards.
*/
- 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)
+ if (start >= max_low_pfn)
continue;
+ if (start < reserved_end)
+ start = reserved_end;
+ if (end > max_low_pfn)
+ end = max_low_pfn;
/*
- * ... finally, did all the rounding and playing
- * around just make the area go away?
+ * ... finally, is the area going away?
*/
- if (last_pfn <= curr_pfn)
+ if (end <= start)
continue;
+ size = end - start;
/* Register lowmem ranges */
- free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
+ free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
+ memory_present(0, start, end);
}
- /* Reserve the bootmap memory. */
- reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
-#endif
+ /*
+ * Reserve the bootmap memory.
+ */
+ reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
-#ifdef CONFIG_BLK_DEV_INITRD
- /* Board specific code should have set up initrd_start and initrd_end */
- ROOT_DEV = Root_RAM0;
- if (&__rd_start != &__rd_end) {
- initrd_start = (unsigned long)&__rd_start;
- initrd_end = (unsigned long)&__rd_end;
- }
- initrd_below_start_ok = 1;
- if (initrd_start) {
- unsigned long initrd_size = ((unsigned char *)initrd_end) - ((unsigned char *)initrd_start);
- 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",
- sizeof(long) * 2, CPHYSADDR(initrd_end),
- sizeof(long) * 2, PFN_PHYS(max_low_pfn));
- initrd_start = initrd_end = 0;
- }
+ /*
+ * Reserve initrd memory if needed.
+ */
+ finalize_initrd();
+}
+
+#endif /* CONFIG_SGI_IP27 */
+
+/*
+ * 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.
+ *
+ * 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.
+ */
+
+static int usermem __initdata = 0;
+
+static int __init early_parse_mem(char *p)
+{
+ unsigned long start, size;
+
+ /*
+ * If a user specifies memory size, we
+ * blow away any automatically generated
+ * size.
+ */
+ if (usermem == 0) {
+ boot_mem_map.nr_map = 0;
+ usermem = 1;
+ }
+ start = 0;
+ size = memparse(p, &p);
+ if (*p == '@')
+ start = memparse(p + 1, &p);
+
+ add_memory_region(start, size, BOOT_MEM_RAM);
+ return 0;
+}
+early_param("mem", early_parse_mem);
+
+static void __init arch_mem_init(char **cmdline_p)
+{
+ extern void plat_mem_setup(void);
+
+ /* call board setup routine */
+ plat_mem_setup();
+
+ printk("Determined physical RAM map:\n");
+ print_memory_map();
+
+ strlcpy(command_line, arcs_cmdline, sizeof(command_line));
+ strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+
+ *cmdline_p = command_line;
+
+ parse_early_param();
+
+ if (usermem) {
+ printk("User-defined physical RAM map:\n");
+ print_memory_map();
}
-#endif /* CONFIG_BLK_DEV_INITRD */
+
+ bootmem_init();
+ sparse_init();
+ paging_init();
}
-static inline void resource_init(void)
+static void __init 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;
+ if (UNCAC_BASE != IO_BASE)
+ return;
+
+ code_resource.start = __pa_symbol(&_text);
+ code_resource.end = __pa_symbol(&_etext) - 1;
+ data_resource.start = __pa_symbol(&_etext);
+ data_resource.end = __pa_symbol(&_edata) - 1;
/*
* Request address space for all standard RAM.
start = boot_mem_map.map[i].addr;
end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
- if (start >= MAXMEM)
+ if (start >= HIGHMEM_START)
continue;
- if (end >= MAXMEM)
- end = MAXMEM - 1;
+ if (end >= HIGHMEM_START)
+ end = HIGHMEM_START - 1;
res = alloc_bootmem(sizeof(struct resource));
switch (boot_mem_map.map[i].type) {
}
}
-#undef PFN_UP
-#undef PFN_DOWN
-#undef PFN_PHYS
-
-#undef MAXMEM
-#undef MAXMEM_PFN
-
-static int __initdata earlyinit_debug;
-
-static int __init earlyinit_debug_setup(char *str)
-{
- earlyinit_debug = 1;
- return 1;
-}
-__setup("earlyinit_debug", earlyinit_debug_setup);
-
-extern initcall_t __earlyinitcall_start, __earlyinitcall_end;
-
-static void __init do_earlyinitcalls(void)
-{
- initcall_t *call, *start, *end;
-
- start = &__earlyinitcall_start;
- end = &__earlyinitcall_end;
-
- for (call = start; call < end; call++) {
- if (earlyinit_debug)
- printk("calling earlyinitcall 0x%p\n", *call);
-
- (*call)();
- }
-}
-
void __init setup_arch(char **cmdline_p)
{
- unsigned int status;
-
cpu_probe();
prom_init();
cpu_report();
-#ifdef CONFIG_MIPS32
- /* Disable coprocessors and set FPU for 16/32 FPR register model */
- status = read_c0_status();
- status &= ~(ST0_CU1|ST0_CU2|ST0_CU3|ST0_KX|ST0_SX|ST0_FR);
- status |= ST0_CU0;
- write_c0_status(status);
-#endif
-#ifdef CONFIG_MIPS64
- /*
- * On IP27, I am seeing the TS bit set when the kernel is loaded.
- * Maybe because the kernel is in ckseg0 and not xkphys? Clear it
- * anyway ...
- */
- status = read_c0_status();
- status &= ~(ST0_BEV|ST0_TS|ST0_CU1|ST0_CU2|ST0_CU3);
- status |= (ST0_CU0|ST0_KX|ST0_SX|ST0_FR);
- write_c0_status(status);
-#endif
-
#if defined(CONFIG_VT)
#if defined(CONFIG_VGA_CONSOLE)
conswitchp = &vga_con;
#endif
#endif
- /* call board setup routine */
- do_earlyinitcalls();
-
- strlcpy(command_line, arcs_cmdline, sizeof(command_line));
- strlcpy(saved_command_line, command_line, COMMAND_LINE_SIZE);
+ arch_mem_init(cmdline_p);
- *cmdline_p = command_line;
-
- parse_cmdline_early();
- bootmem_init();
- paging_init();
resource_init();
+#ifdef CONFIG_SMP
+ plat_smp_setup();
+#endif
}
int __init fpu_disable(char *s)
{
- cpu_data[0].options &= ~MIPS_CPU_FPU;
+ int i;
+
+ for (i = 0; i < NR_CPUS; i++)
+ cpu_data[i].options &= ~MIPS_CPU_FPU;
return 1;
}
__setup("nofpu", fpu_disable);
+
+int __init dsp_disable(char *s)
+{
+ cpu_data[0].ases &= ~MIPS_ASE_DSP;
+
+ return 1;
+}
+
+__setup("nodsp", dsp_disable);
git://git.onelab.eu / linux-2.6.git / blobdiff