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Subject[PATCH] Separate CPU detection from setup_arch

Hallo Linus,

The following patch separates the CPU detection and BIOS interface stuff
in arch/i386/kernel/setup.c from the actual CPU init. This makes it a bit
easier to share code with the x86-64 port [we want to share all the CPU
detection and e820 code, but the cpu init has to be separated]
The patch looks big, but it is basically only cut'n'paste work and should
have no functional changes on i386.

Could you apply it ? Against 2.4.0test10pre7


Thanks,


-Andi



--- arch/i386/kernel/setup.c-CPUINIT Tue Oct 24 10:45:20 2000
+++ arch/i386/kernel/setup.c Tue Oct 31 12:30:16 2000
@@ -61,13 +61,9 @@
* This file handles the architecture-dependent parts of initialization
*/

-#include <linux/errno.h>
-#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
-#include <linux/unistd.h>
-#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/user.h>
#include <linux/a.out.h>
@@ -76,14 +72,9 @@
#include <linux/delay.h>
#include <linux/config.h>
#include <linux/init.h>
-#include <linux/apm_bios.h>
-#ifdef CONFIG_BLK_DEV_RAM
-#include <linux/blk.h>
-#endif
#include <linux/highmem.h>
#include <linux/bootmem.h>
#include <asm/processor.h>
-#include <linux/console.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/io.h>
@@ -95,6 +86,8 @@
#include <asm/dma.h>
#include <asm/mpspec.h>
#include <asm/mmu_context.h>
+#include <asm/setup.h>
+
/*
* Machine setup..
*/
@@ -102,6 +95,9 @@
char ignore_irq13; /* set if exception 16 works */
struct cpuinfo_x86 boot_cpu_data = { 0, 0, 0, 0, -1, 1, 0, 0, -1 };

+extern char _text, _etext, _edata, _end;
+
+
unsigned long mmu_cr4_features;

/*
@@ -119,26 +115,10 @@
/*
* Setup options
*/
-struct drive_info_struct { char dummy[32]; } drive_info;
-struct screen_info screen_info;
-struct apm_bios_info apm_bios_info;
-struct sys_desc_table_struct {
- unsigned short length;
- unsigned char table[0];
-};

struct e820map e820;

-unsigned char aux_device_present;

-#ifdef CONFIG_BLK_DEV_RAM
-extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
-extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
-extern int rd_image_start; /* starting block # of image */
-#endif
-
-extern int root_mountflags;
-extern char _text, _etext, _edata, _end;
extern unsigned long cpu_khz;

static int disable_x86_serial_nr __initdata = 1;
@@ -296,7 +276,6 @@
}
#endif

-
static char command_line[COMMAND_LINE_SIZE];
char saved_command_line[COMMAND_LINE_SIZE];

@@ -520,7 +499,7 @@
} /* setup_memory_region */


-static inline void parse_mem_cmdline (char ** cmdline_p)
+void __init parse_mem_cmdline (char ** cmdline_p)
{
char c = ' ', *to = command_line, *from = COMMAND_LINE;
int len = 0;
@@ -590,262 +569,6 @@
}
}

-void __init setup_arch(char **cmdline_p)
-{
- unsigned long bootmap_size;
- unsigned long start_pfn, max_pfn, max_low_pfn;
- int i;
-
-#ifdef CONFIG_VISWS
- visws_get_board_type_and_rev();
-#endif
-
- ROOT_DEV = to_kdev_t(ORIG_ROOT_DEV);
- drive_info = DRIVE_INFO;
- screen_info = SCREEN_INFO;
- apm_bios_info = APM_BIOS_INFO;
- if( SYS_DESC_TABLE.length != 0 ) {
- MCA_bus = SYS_DESC_TABLE.table[3] &0x2;
- machine_id = SYS_DESC_TABLE.table[0];
- machine_submodel_id = SYS_DESC_TABLE.table[1];
- BIOS_revision = SYS_DESC_TABLE.table[2];
- }
- aux_device_present = AUX_DEVICE_INFO;
-
-#ifdef CONFIG_BLK_DEV_RAM
- rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
- rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
- rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
-#endif
- setup_memory_region();
-
- if (!MOUNT_ROOT_RDONLY)
- root_mountflags &= ~MS_RDONLY;
- 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;
-
- code_resource.start = virt_to_bus(&_text);
- code_resource.end = virt_to_bus(&_etext)-1;
- data_resource.start = virt_to_bus(&_etext);
- data_resource.end = virt_to_bus(&_edata)-1;
-
- parse_mem_cmdline(cmdline_p);
-
-#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
-#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
-#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
-
-/*
- * 128MB for vmalloc and initrd
- */
-#define VMALLOC_RESERVE (unsigned long)(128 << 20)
-#define MAXMEM (unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE)
-#define MAXMEM_PFN PFN_DOWN(MAXMEM)
-#define MAX_NONPAE_PFN (1 << 20)
-
- /*
- * partially used pages are not usable - thus
- * we are rounding upwards:
- */
- start_pfn = PFN_UP(__pa(&_end));
-
- /*
- * Find the highest page frame number we have available
- */
- max_pfn = 0;
- for (i = 0; i < e820.nr_map; i++) {
- unsigned long start, end;
- /* RAM? */
- if (e820.map[i].type != E820_RAM)
- continue;
- start = PFN_UP(e820.map[i].addr);
- end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
- if (start >= end)
- continue;
- if (end > max_pfn)
- max_pfn = end;
- }
-
- /*
- * 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);
- if (max_pfn > MAX_NONPAE_PFN)
- printk(KERN_WARNING "Use a PAE enabled kernel.\n");
- else
- printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
-#else /* !CONFIG_HIGHMEM */
-#ifndef CONFIG_X86_PAE
- if (max_pfn > MAX_NONPAE_PFN) {
- max_pfn = MAX_NONPAE_PFN;
- printk(KERN_WARNING "Warning only 4GB will be used.\n");
- printk(KERN_WARNING "Use a PAE enabled kernel.\n");
- }
-#endif /* !CONFIG_X86_PAE */
-#endif /* !CONFIG_HIGHMEM */
- }
-
-#ifdef CONFIG_HIGHMEM
- highstart_pfn = highend_pfn = max_pfn;
- if (max_pfn > MAXMEM_PFN) {
- highstart_pfn = MAXMEM_PFN;
- printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
- pages_to_mb(highend_pfn - highstart_pfn));
- }
-#endif
- /*
- * Initialize the boot-time allocator (with low memory only):
- */
- bootmap_size = init_bootmem(start_pfn, max_low_pfn);
-
- /*
- * Register fully available low RAM pages with the bootmem allocator.
- */
- for (i = 0; i < e820.nr_map; i++) {
- unsigned long curr_pfn, last_pfn, size;
- /*
- * Reserve usable low memory
- */
- if (e820.map[i].type != E820_RAM)
- continue;
- /*
- * We are rounding up the start address of usable memory:
- */
- curr_pfn = PFN_UP(e820.map[i].addr);
- if (curr_pfn >= max_low_pfn)
- continue;
- /*
- * ... and at the end of the usable range downwards:
- */
- last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
-
- if (last_pfn > max_low_pfn)
- last_pfn = max_low_pfn;
-
- /*
- * .. finally, did all the rounding and playing
- * around just make the area go away?
- */
- if (last_pfn <= curr_pfn)
- continue;
-
- size = last_pfn - curr_pfn;
- free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
- }
- /*
- * Reserve the bootmem bitmap itself as well. We do this in two
- * steps (first step was init_bootmem()) because this catches
- * the (very unlikely) case of us accidentally initializing the
- * bootmem allocator with an invalid RAM area.
- */
- reserve_bootmem(HIGH_MEMORY, (PFN_PHYS(start_pfn) +
- bootmap_size + PAGE_SIZE-1) - (HIGH_MEMORY));
-
- /*
- * reserve physical page 0 - it's a special BIOS page on many boxes,
- * enabling clean reboots, SMP operation, laptop functions.
- */
- reserve_bootmem(0, PAGE_SIZE);
-
-#ifdef CONFIG_SMP
- /*
- * But first pinch a few for the stack/trampoline stuff
- * FIXME: Don't need the extra page at 4K, but need to fix
- * trampoline before removing it. (see the GDT stuff)
- */
- reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
- smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
-#endif
-
-#ifdef CONFIG_X86_IO_APIC
- /*
- * Find and reserve possible boot-time SMP configuration:
- */
- find_smp_config();
-#endif
- paging_init();
-#ifdef CONFIG_X86_IO_APIC
- /*
- * get boot-time SMP configuration:
- */
- if (smp_found_config)
- get_smp_config();
-#endif
-#ifdef CONFIG_X86_LOCAL_APIC
- init_apic_mappings();
-#endif
-
-#ifdef CONFIG_BLK_DEV_INITRD
- if (LOADER_TYPE && INITRD_START) {
- if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
- reserve_bootmem(INITRD_START, INITRD_SIZE);
- initrd_start =
- INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
- initrd_end = initrd_start+INITRD_SIZE;
- }
- else {
- printk("initrd extends beyond end of memory "
- "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
- INITRD_START + INITRD_SIZE,
- max_low_pfn << PAGE_SHIFT);
- initrd_start = 0;
- }
- }
-#endif
-
- /*
- * Request address space for all standard RAM and ROM resources
- * and also for regions reported as reserved by the e820.
- */
- probe_roms();
- for (i = 0; i < e820.nr_map; i++) {
- struct resource *res;
- if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
- continue;
- res = alloc_bootmem_low(sizeof(struct resource));
- switch (e820.map[i].type) {
- case E820_RAM: res->name = "System RAM"; break;
- case E820_ACPI: res->name = "ACPI Tables"; break;
- case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
- default: res->name = "reserved";
- }
- res->start = e820.map[i].addr;
- res->end = res->start + e820.map[i].size - 1;
- res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
- request_resource(&iomem_resource, res);
- if (e820.map[i].type == E820_RAM) {
- /*
- * We dont't know which RAM region contains kernel data,
- * so we try it repeatedly and let the resource manager
- * test it.
- */
- request_resource(res, &code_resource);
- request_resource(res, &data_resource);
- }
- }
- request_resource(&iomem_resource, &vram_resource);
-
- /* request I/O space for devices used on all i[345]86 PCs */
- for (i = 0; i < STANDARD_IO_RESOURCES; i++)
- request_resource(&ioport_resource, standard_io_resources+i);
-
-#ifdef CONFIG_VT
-#if defined(CONFIG_VGA_CONSOLE)
- conswitchp = &vga_con;
-#elif defined(CONFIG_DUMMY_CONSOLE)
- conswitchp = &dummy_con;
-#endif
-#endif
-}
-
static int __init get_model_name(struct cpuinfo_x86 *c)
{
unsigned int n, dummy, *v;
@@ -1800,72 +1523,57 @@
__setup("notsc", tsc_setup);
#endif

-static unsigned long cpu_initialized __initdata = 0;

-/*
- * cpu_init() initializes state that is per-CPU. Some data is already
- * initialized (naturally) in the bootstrap process, such as the GDT
- * and IDT. We reload them nevertheless, this function acts as a
- * 'CPU state barrier', nothing should get across.
- */
-void __init cpu_init (void)
+/* reserve memory areas from the E820 map */
+static void __init reserve_820(void)
{
- int nr = smp_processor_id();
- struct tss_struct * t = &init_tss[nr];
+ int i;

- if (test_and_set_bit(nr, &cpu_initialized)) {
- printk("CPU#%d already initialized!\n", nr);
- for (;;) __sti();
- }
- printk("Initializing CPU#%d\n", nr);
-
- if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
- clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
-#ifndef CONFIG_X86_TSC
- if (tsc_disable && cpu_has_tsc) {
- printk("Disabling TSC...\n");
- boot_cpu_data.x86_capability &= ~X86_FEATURE_TSC;
- set_in_cr4(X86_CR4_TSD);
+ for (i = 0; i < e820.nr_map; i++) {
+ struct resource *res;
+ if (e820.map[i].addr + e820.map[i].size > 0x100000000ULL)
+ continue;
+ res = alloc_bootmem_low(sizeof(struct resource));
+ switch (e820.map[i].type) {
+ case E820_RAM: res->name = "System RAM"; break;
+ case E820_ACPI: res->name = "ACPI Tables"; break;
+ case E820_NVS: res->name = "ACPI Non-volatile Storage"; break;
+ default: res->name = "reserved";
+ }
+ res->start = e820.map[i].addr;
+ res->end = res->start + e820.map[i].size - 1;
+ res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+ request_resource(&iomem_resource, res);
+ if (e820.map[i].type == E820_RAM) {
+ /*
+ * We dont't know which RAM region contains kernel data,
+ * so we try it repeatedly and let the resource manager
+ * test it.
+ */
+ request_resource(res, &code_resource);
+ request_resource(res, &data_resource);
+ }
}
-#endif
-
- __asm__ __volatile__("lgdt %0": "=m" (gdt_descr));
- __asm__ __volatile__("lidt %0": "=m" (idt_descr));
-
- /*
- * Delete NT
- */
- __asm__("pushfl ; andl $0xffffbfff,(%esp) ; popfl");
-
- /*
- * set up and load the per-CPU TSS and LDT
- */
- atomic_inc(&init_mm.mm_count);
- current->active_mm = &init_mm;
- if(current->mm)
- BUG();
- enter_lazy_tlb(&init_mm, current, nr);
-
- t->esp0 = current->thread.esp0;
- set_tss_desc(nr,t);
- gdt_table[__TSS(nr)].b &= 0xfffffdff;
- load_TR(nr);
- load_LDT(&init_mm);
-
- /*
- * Clear all 6 debug registers:
- */
+}

-#define CD(register) __asm__("movl %0,%%db" #register ::"r"(0) );
+/* Reserve IO areas */
+void __init request_pc(void)
+{
+ int i;

- CD(0); CD(1); CD(2); CD(3); /* no db4 and db5 */; CD(6); CD(7);
+ probe_roms();
+ reserve_820();
+ request_resource(&iomem_resource, &vram_resource);

-#undef CD
+ /* request I/O space for devices used on all i[345]86 PCs */
+ for (i = 0; i < STANDARD_IO_RESOURCES; i++)
+ request_resource(&ioport_resource, standard_io_resources+i);
+}

- /*
- * Force FPU initialization:
- */
- current->flags &= ~PF_USEDFPU;
- current->used_math = 0;
- stts();
-}
+void __init code_resource_init(void)
+{
+ code_resource.start = virt_to_bus(&_text);
+ code_resource.end = virt_to_bus(&_etext)-1;
+ data_resource.start = virt_to_bus(&_etext);
+ data_resource.end = virt_to_bus(&_edata)-1;
+}
--- arch/i386/kernel/Makefile-CPUINIT Tue Oct 24 10:45:20 2000
+++ arch/i386/kernel/Makefile Tue Oct 31 11:43:35 2000
@@ -18,7 +18,7 @@

obj-y := process.o semaphore.o signal.o entry.o traps.o irq.o vm86.o \
ptrace.o i8259.o ioport.o ldt.o setup.o time.o sys_i386.o \
- pci-dma.o i386_ksyms.o i387.o bluesmoke.o
+ pci-dma.o i386_ksyms.o i387.o bluesmoke.o cpuinit.o


ifdef CONFIG_PCI
--- arch/i386/kernel/cpuinit.c-CPUINIT Sat Jul 29 14:48:15 2000
+++ arch/i386/kernel/cpuinit.c Tue Oct 31 12:26:08 2000
@@ -0,0 +1,339 @@
+/*
+ * linux/arch/i386/kernel/cpuinit.c
+ *
+ * Copyright (C) 1995 Linus Torvalds
+ *
+ * Split from arch/i386/kernel/setup.c in 2000/10 by Andi Kleen.
+ * See setup.c for revision history.
+ */
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/config.h>
+#include <asm/setup.h>
+#ifdef CONFIG_BLK_DEV_RAM
+#include <linux/blk.h>
+#endif
+#include <linux/unistd.h>
+#include <linux/ptrace.h>
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/smp.h>
+#include <asm/cobalt.h>
+#include <asm/msr.h>
+#include <asm/desc.h>
+#include <asm/e820.h>
+#include <asm/dma.h>
+#include <asm/mpspec.h>
+#include <asm/mmu_context.h>
+#include <asm/processor.h>
+#include <linux/console.h>
+#include <linux/highmem.h>
+#include <linux/bootmem.h>
+
+#ifdef CONFIG_BLK_DEV_RAM
+extern int rd_doload; /* 1 = load ramdisk, 0 = don't load */
+extern int rd_prompt; /* 1 = prompt for ramdisk, 0 = don't prompt */
+extern int rd_image_start; /* starting block # of image */
+#endif
+
+extern int root_mountflags;
+extern char _text, _etext, _edata, _end;
+
+static unsigned long cpu_initialized __initdata = 0;
+
+struct drive_info_struct drive_info;
+struct screen_info screen_info;
+struct apm_bios_info apm_bios_info;
+unsigned char aux_device_present;
+
+void __init setup_arch(char **cmdline_p)
+{
+ unsigned long bootmap_size;
+ unsigned long start_pfn, max_pfn, max_low_pfn;
+ int i;
+
+#ifdef CONFIG_VISWS
+ visws_get_board_type_and_rev();
+#endif
+
+ ROOT_DEV = to_kdev_t(ORIG_ROOT_DEV);
+ drive_info = DRIVE_INFO;
+ screen_info = SCREEN_INFO;
+ apm_bios_info = APM_BIOS_INFO;
+ if( SYS_DESC_TABLE.length != 0 ) {
+ MCA_bus = SYS_DESC_TABLE.table[3] &0x2;
+ machine_id = SYS_DESC_TABLE.table[0];
+ machine_submodel_id = SYS_DESC_TABLE.table[1];
+ BIOS_revision = SYS_DESC_TABLE.table[2];
+ }
+ aux_device_present = AUX_DEVICE_INFO;
+
+#ifdef CONFIG_BLK_DEV_RAM
+ rd_image_start = RAMDISK_FLAGS & RAMDISK_IMAGE_START_MASK;
+ rd_prompt = ((RAMDISK_FLAGS & RAMDISK_PROMPT_FLAG) != 0);
+ rd_doload = ((RAMDISK_FLAGS & RAMDISK_LOAD_FLAG) != 0);
+#endif
+ setup_memory_region();
+
+ if (!MOUNT_ROOT_RDONLY)
+ root_mountflags &= ~MS_RDONLY;
+ 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;
+
+ code_resource_init();
+
+ parse_mem_cmdline(cmdline_p);
+
+#define PFN_UP(x) (((x) + PAGE_SIZE-1) >> PAGE_SHIFT)
+#define PFN_DOWN(x) ((x) >> PAGE_SHIFT)
+#define PFN_PHYS(x) ((x) << PAGE_SHIFT)
+
+/*
+ * 128MB for vmalloc and initrd
+ */
+#define VMALLOC_RESERVE (unsigned long)(128 << 20)
+#define MAXMEM (unsigned long)(-PAGE_OFFSET-VMALLOC_RESERVE)
+#define MAXMEM_PFN PFN_DOWN(MAXMEM)
+#define MAX_NONPAE_PFN (1 << 20)
+
+ /*
+ * partially used pages are not usable - thus
+ * we are rounding upwards:
+ */
+ start_pfn = PFN_UP(__pa(&_end));
+
+ /*
+ * Find the highest page frame number we have available
+ */
+ max_pfn = 0;
+ for (i = 0; i < e820.nr_map; i++) {
+ unsigned long start, end;
+ /* RAM? */
+ if (e820.map[i].type != E820_RAM)
+ continue;
+ start = PFN_UP(e820.map[i].addr);
+ end = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
+ if (start >= end)
+ continue;
+ if (end > max_pfn)
+ max_pfn = end;
+ }
+
+ /*
+ * 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);
+ if (max_pfn > MAX_NONPAE_PFN)
+ printk(KERN_WARNING "Use a PAE enabled kernel.\n");
+ else
+ printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
+#else /* !CONFIG_HIGHMEM */
+#ifndef CONFIG_X86_PAE
+ if (max_pfn > MAX_NONPAE_PFN) {
+ max_pfn = MAX_NONPAE_PFN;
+ printk(KERN_WARNING "Warning only 4GB will be used.\n");
+ printk(KERN_WARNING "Use a PAE enabled kernel.\n");
+ }
+#endif /* !CONFIG_X86_PAE */
+#endif /* !CONFIG_HIGHMEM */
+ }
+
+#ifdef CONFIG_HIGHMEM
+ highstart_pfn = highend_pfn = max_pfn;
+ if (max_pfn > MAXMEM_PFN) {
+ highstart_pfn = MAXMEM_PFN;
+ printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
+ pages_to_mb(highend_pfn - highstart_pfn));
+ }
+#endif
+ /*
+ * Initialize the boot-time allocator (with low memory only):
+ */
+ bootmap_size = init_bootmem(start_pfn, max_low_pfn);
+
+ /*
+ * Register fully available low RAM pages with the bootmem allocator.
+ */
+ for (i = 0; i < e820.nr_map; i++) {
+ unsigned long curr_pfn, last_pfn, size;
+ /*
+ * Reserve usable low memory
+ */
+ if (e820.map[i].type != E820_RAM)
+ continue;
+ /*
+ * We are rounding up the start address of usable memory:
+ */
+ curr_pfn = PFN_UP(e820.map[i].addr);
+ if (curr_pfn >= max_low_pfn)
+ continue;
+ /*
+ * ... and at the end of the usable range downwards:
+ */
+ last_pfn = PFN_DOWN(e820.map[i].addr + e820.map[i].size);
+
+ if (last_pfn > max_low_pfn)
+ last_pfn = max_low_pfn;
+
+ /*
+ * .. finally, did all the rounding and playing
+ * around just make the area go away?
+ */
+ if (last_pfn <= curr_pfn)
+ continue;
+
+ size = last_pfn - curr_pfn;
+ free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
+ }
+ /*
+ * Reserve the bootmem bitmap itself as well. We do this in two
+ * steps (first step was init_bootmem()) because this catches
+ * the (very unlikely) case of us accidentally initializing the
+ * bootmem allocator with an invalid RAM area.
+ */
+ reserve_bootmem(HIGH_MEMORY, (PFN_PHYS(start_pfn) +
+ bootmap_size + PAGE_SIZE-1) - (HIGH_MEMORY));
+
+ /*
+ * reserve physical page 0 - it's a special BIOS page on many boxes,
+ * enabling clean reboots, SMP operation, laptop functions.
+ */
+ reserve_bootmem(0, PAGE_SIZE);
+
+#ifdef CONFIG_SMP
+ /*
+ * But first pinch a few for the stack/trampoline stuff
+ * FIXME: Don't need the extra page at 4K, but need to fix
+ * trampoline before removing it. (see the GDT stuff)
+ */
+ reserve_bootmem(PAGE_SIZE, PAGE_SIZE);
+ smp_alloc_memory(); /* AP processor realmode stacks in low memory*/
+#endif
+
+#ifdef CONFIG_X86_IO_APIC
+ /*
+ * Find and reserve possible boot-time SMP configuration:
+ */
+ find_smp_config();
+#endif
+ paging_init();
+#ifdef CONFIG_X86_IO_APIC
+ /*
+ * get boot-time SMP configuration:
+ */
+ if (smp_found_config)
+ get_smp_config();
+#endif
+#ifdef CONFIG_X86_LOCAL_APIC
+ init_apic_mappings();
+#endif
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ if (LOADER_TYPE && INITRD_START) {
+ if (INITRD_START + INITRD_SIZE <= (max_low_pfn << PAGE_SHIFT)) {
+ reserve_bootmem(INITRD_START, INITRD_SIZE);
+ initrd_start =
+ INITRD_START ? INITRD_START + PAGE_OFFSET : 0;
+ initrd_end = initrd_start+INITRD_SIZE;
+ }
+ else {
+ printk("initrd extends beyond end of memory "
+ "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
+ INITRD_START + INITRD_SIZE,
+ max_low_pfn << PAGE_SHIFT);
+ initrd_start = 0;
+ }
+ }
+#endif
+
+ /*
+ * Request address space for all standard RAM and ROM resources
+ * and also for regions reported as reserved by the e820.
+ */
+ request_pc();
+
+#ifdef CONFIG_VT
+#if defined(CONFIG_VGA_CONSOLE)
+ conswitchp = &vga_con;
+#elif defined(CONFIG_DUMMY_CONSOLE)
+ conswitchp = &dummy_con;
+#endif
+#endif
+}
+
+/*
+ * cpu_init() initializes state that is per-CPU. Some data is already
+ * initialized (naturally) in the bootstrap process, such as the GDT
+ * and IDT. We reload them nevertheless, this function acts as a
+ * 'CPU state barrier', nothing should get across.
+ */
+void __init cpu_init (void)
+{
+ int nr = smp_processor_id();
+ struct tss_struct * t = &init_tss[nr];
+
+ if (test_and_set_bit(nr, &cpu_initialized)) {
+ printk("CPU#%d already initialized!\n", nr);
+ for (;;) __sti();
+ }
+ printk("Initializing CPU#%d\n", nr);
+
+ if (cpu_has_vme || cpu_has_tsc || cpu_has_de)
+ clear_in_cr4(X86_CR4_VME|X86_CR4_PVI|X86_CR4_TSD|X86_CR4_DE);
+#ifndef CONFIG_X86_TSC
+ if (tsc_disable && cpu_has_tsc) {
+ printk("Disabling TSC...\n");
+ boot_cpu_data.x86_capability &= ~X86_FEATURE_TSC;
+ set_in_cr4(X86_CR4_TSD);
+ }
+#endif
+
+ __asm__ __volatile__("lgdt %0": "=m" (gdt_descr));
+ __asm__ __volatile__("lidt %0": "=m" (idt_descr));
+
+ /*
+ * Delete NT
+ */
+ __asm__("pushfl ; andl $0xffffbfff,(%esp) ; popfl");
+
+ /*
+ * set up and load the per-CPU TSS and LDT
+ */
+ atomic_inc(&init_mm.mm_count);
+ current->active_mm = &init_mm;
+ if(current->mm)
+ BUG();
+ enter_lazy_tlb(&init_mm, current, nr);
+
+ t->esp0 = current->thread.esp0;
+ set_tss_desc(nr,t);
+ gdt_table[__TSS(nr)].b &= 0xfffffdff;
+ load_TR(nr);
+ load_LDT(&init_mm);
+
+ /*
+ * Clear all 6 debug registers:
+ */
+
+#define CD(register) __asm__("movl %0,%%db" #register ::"r"(0) );
+
+ CD(0); CD(1); CD(2); CD(3); /* no db4 and db5 */; CD(6); CD(7);
+
+#undef CD
+
+ /*
+ * Force FPU initialization:
+ */
+ current->flags &= ~PF_USEDFPU;
+ current->used_math = 0;
+ stts();
+}
+
--- include/asm-i386/setup.h-CPUINIT Wed Dec 15 16:50:17 1999
+++ include/asm-i386/setup.h Tue Oct 31 12:27:53 2000
@@ -1,10 +1,50 @@
+#ifndef _i386_SETUP_H
+#define _i386_SETUP_H
+
+#include <linux/apm_bios.h>
+
+struct sys_desc_table_struct {
+ unsigned short length;
+ unsigned char table[0];
+};
+
+struct drive_info_struct {
+ char dummy[32];
+};
+
+extern struct e820map e820;
+
/*
- * Just a place holder. We don't want to have to test x86 before
- * we include stuff
+ * This is set up by the setup-routine at boot-time
*/
+#define PARAM ((unsigned char *)empty_zero_page)
+#define SCREEN_INFO (*(struct screen_info *) (PARAM+0))
+#define EXT_MEM_K (*(unsigned short *) (PARAM+2))
+#define ALT_MEM_K (*(unsigned long *) (PARAM+0x1e0))
+#define E820_MAP_NR (*(char*) (PARAM+E820NR))
+#define E820_MAP ((struct e820entry *) (PARAM+E820MAP))
+#define APM_BIOS_INFO (*(struct apm_bios_info *) (PARAM+0x40))
+#define DRIVE_INFO (*(struct drive_info_struct *) (PARAM+0x80))
+#define SYS_DESC_TABLE (*(struct sys_desc_table_struct*)(PARAM+0xa0))
+#define MOUNT_ROOT_RDONLY (*(unsigned short *) (PARAM+0x1F2))
+#define RAMDISK_FLAGS (*(unsigned short *) (PARAM+0x1F8))
+#define ORIG_ROOT_DEV (*(unsigned short *) (PARAM+0x1FC))
+#define AUX_DEVICE_INFO (*(unsigned char *) (PARAM+0x1FF))
+#define LOADER_TYPE (*(unsigned char *) (PARAM+0x210))
+#define KERNEL_START (*(unsigned long *) (PARAM+0x214))
+#define INITRD_START (*(unsigned long *) (PARAM+0x218))
+#define INITRD_SIZE (*(unsigned long *) (PARAM+0x21c))
+#define COMMAND_LINE ((char *) (PARAM+2048))
+#define COMMAND_LINE_SIZE 256

-#ifndef _i386_SETUP_H
-#define _i386_SETUP_H
+#define RAMDISK_IMAGE_START_MASK 0x07FF
+#define RAMDISK_PROMPT_FLAG 0x8000
+#define RAMDISK_LOAD_FLAG 0x4000

+extern void visws_get_board_type_and_rev(void);
+extern void setup_memory_region(void);
+extern void parse_mem_cmdline(char **);
+extern void request_pc(void);
+extern void code_resource_init(void);

#endif /* _i386_SETUP_H */
-
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