xensetup.c

xen 3.2.2 源码

/******************************************************************************
 * xensetup.c
 * Copyright (c) 2004-2005  Hewlett-Packard Co
 *         Dan Magenheimer <[e-mail]>
 */

#include <xen/config.h>
#include <xen/lib.h>
#include <xen/errno.h>
#include <xen/multiboot.h>
#include <xen/sched.h>
#include <xen/mm.h>
#include <public/version.h>
#include <xen/gdbstub.h>
#include <xen/version.h>
#include <xen/console.h>
#include <xen/domain.h>
#include <xen/serial.h>
#include <xen/trace.h>
#include <xen/keyhandler.h>
#include <xen/vga.h>
#include <asm/meminit.h>
#include <asm/page.h>
#include <asm/setup.h>
#include <xen/string.h>
#include <asm/vmx.h>
#include <linux/efi.h>
#include <asm/iosapic.h>
#include <xen/softirq.h>
#include <xen/rcupdate.h>
#include <xsm/acm/acm_hooks.h>
#include <asm/sn/simulator.h>

unsigned long xenheap_phys_end, total_pages;

char saved_command_line[COMMAND_LINE_SIZE];
char __initdata dom0_command_line[COMMAND_LINE_SIZE];

cpumask_t cpu_present_map;

extern unsigned long domain0_ready;

int find_max_pfn (unsigned long, unsigned long, void *);

/* FIXME: which header these declarations should be there ? */
extern void early_setup_arch(char **);
extern void late_setup_arch(char **);
extern void hpsim_serial_init(void);
extern void setup_per_cpu_areas(void);
extern void mem_init(void);
extern void init_IRQ(void);
extern void trap_init(void);
extern void xen_patch_kernel(void);

/* nosmp: ignore secondary processors */
static int __initdata opt_nosmp;
boolean_param("nosmp", opt_nosmp);

/* maxcpus: maximum number of CPUs to activate */
static unsigned int __initdata max_cpus = NR_CPUS;
integer_param("maxcpus", max_cpus); 

/* xencons: toggle xenconsole input (and irq).
   Note: you have to disable 8250 serials in domains (to avoid use of the
   same resource).  */
static int __initdata opt_xencons = 1;
integer_param("xencons", opt_xencons);

/* xencons_poll: toggle non-legacy xencons UARTs to run in polling mode */
static int __initdata opt_xencons_poll;
boolean_param("xencons_poll", opt_xencons_poll);

unsigned long xenheap_size = XENHEAP_DEFAULT_SIZE;
unsigned long xen_pstart;
void *xen_pickle_offset __read_mostly;

static int __init
xen_count_pages(u64 start, u64 end, void *arg)
{
    unsigned long *count = arg;

    /* FIXME: do we need consider difference between DMA-usable memory and
     * normal memory? Seems that HV has no requirement to operate DMA which
     * is owned by Dom0? */
    *count += (end - start) >> PAGE_SHIFT;
    return 0;
}

static void __init do_initcalls(void)
{
    initcall_t *call;
    for ( call = &__initcall_start; call < &__initcall_end; call++ )
        (*call)();
}

/*
 * IPF loader only supports one command line currently, for
 * both xen and guest kernel. This function provides pre-parse
 * to mixed command line, to split it into two parts.
 *
 * User should split the parameters by "--", with strings after
 * spliter for guest kernel. Missing "--" means whole line belongs
 * to guest. Example:
 *	"com2=57600,8n1 console=com2 -- console=ttyS1 console=tty
 * root=/dev/sda3 ro"
 */
static char null[4] = { 0 };

void __init early_cmdline_parse(char **cmdline_p)
{
    char *guest_cmd;
    static const char * const split = "--";

    if (*cmdline_p == NULL) {
	*cmdline_p = &null[0];
	saved_command_line[0] = '\0';
	dom0_command_line[0] = '\0';
	return;
    }

    guest_cmd = strstr(*cmdline_p, split);
    /* If no spliter, whole line is for guest */
    if (guest_cmd == NULL) {
	guest_cmd = *cmdline_p;
	*cmdline_p = &null[0];
    } else {
	*guest_cmd = '\0';	/* Split boot parameters for xen and guest */
	guest_cmd += strlen(split);
	while (*guest_cmd == ' ') guest_cmd++;
    }

    strlcpy(saved_command_line, *cmdline_p, COMMAND_LINE_SIZE);
    strlcpy(dom0_command_line, guest_cmd, COMMAND_LINE_SIZE);
    return;
}

struct ns16550_defaults ns16550_com1 = {
    .data_bits = 8,
    .parity    = 'n',
    .stop_bits = 1
};

unsigned int ns16550_com1_gsi;
unsigned int ns16550_com1_polarity;
unsigned int ns16550_com1_trigger;

struct ns16550_defaults ns16550_com2 = {
    .data_bits = 8,
    .parity    = 'n',
    .stop_bits = 1
};

/* efi_print: print efi table at boot */
static int __initdata opt_efi_print;
boolean_param("efi_print", opt_efi_print);

/* print EFI memory map: */
static void __init
efi_print(void)
{
    void *efi_map_start, *efi_map_end;
    u64 efi_desc_size;

    efi_memory_desc_t *md;
    void *p;
    int i;

    if (!opt_efi_print)
        return;

    efi_map_start = __va(ia64_boot_param->efi_memmap);
    efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
    efi_desc_size = ia64_boot_param->efi_memdesc_size;

    for (i = 0, p = efi_map_start; p < efi_map_end; ++i, p += efi_desc_size) {
        md = p;
        printk("mem%02u: type=%2u, attr=0x%016lx, range=[0x%016lx-0x%016lx) "
               "(%luMB)\n", i, md->type, md->attribute, md->phys_addr,
               md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT),
               md->num_pages >> (20 - EFI_PAGE_SHIFT));
    }
}

/*
 * These functions are utility functions for getting and
 * testing memory descriptors for allocating the xenheap area.
 */
static efi_memory_desc_t * __init
efi_get_md (unsigned long phys_addr)
{
    void *efi_map_start, *efi_map_end, *p;
    efi_memory_desc_t *md;
    u64 efi_desc_size;

    efi_map_start = __va(ia64_boot_param->efi_memmap);
    efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
    efi_desc_size = ia64_boot_param->efi_memdesc_size;

    for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
        md = p;
        if (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT))
            return md;
    }
    return 0;
}

static int __init
is_xenheap_usable_memory(efi_memory_desc_t *md)
{
    if (!(md->attribute & EFI_MEMORY_WB))
        return 0;

    switch (md->type) {
        case EFI_LOADER_CODE:
        case EFI_LOADER_DATA:
        case EFI_BOOT_SERVICES_CODE:
        case EFI_BOOT_SERVICES_DATA:
        case EFI_CONVENTIONAL_MEMORY:
            return 1;
    }
    return 0;
}

static inline int __init
md_overlaps(efi_memory_desc_t *md, unsigned long phys_addr)
{
    return (phys_addr - md->phys_addr < (md->num_pages << EFI_PAGE_SHIFT));
}

#define MD_SIZE(md) (md->num_pages << EFI_PAGE_SHIFT)

extern char __init_begin[], __init_end[];
static void noinline init_done(void)
{
    memset(__init_begin, 0, __init_end - __init_begin);
    flush_icache_range((unsigned long)__init_begin, (unsigned long)__init_end);
    init_xenheap_pages(__pa(__init_begin), __pa(__init_end));
    printk("Freed %ldkB init memory.\n",
           (long)(__init_end-__init_begin)>>10);
    
    startup_cpu_idle_loop();
}

int running_on_sim;

static int __init
is_platform_hp_ski(void)
{
    int i;
    long cpuid[6];

    for (i = 0; i < 5; ++i)
        cpuid[i] = ia64_get_cpuid(i);

    if ((cpuid[0] & 0xff) != 'H')
        return 0;
    if ((cpuid[3] & 0xff) != 0x4)
        return 0;
    if (((cpuid[3] >> 8) & 0xff) != 0x0)
        return 0;
    if (((cpuid[3] >> 16) & 0xff) != 0x0)
        return 0;
    if (((cpuid[3] >> 24) & 0x7) != 0x7)
        return 0;

    return 1;
}

void __init start_kernel(void)
{
    char *cmdline;
    unsigned long nr_pages;
    unsigned long dom0_memory_start, dom0_memory_size;
    unsigned long dom0_initrd_start, dom0_initrd_size;
    unsigned long md_end, relo_start, relo_end, relo_size = 0;
    struct domain *idle_domain;
    struct vcpu *dom0_vcpu0;
    efi_memory_desc_t *kern_md, *last_md, *md;
    void *xen_heap_start;
#ifdef CONFIG_SMP
    int i;
#endif

    /* Be sure the struct shared_info size is <= XSI_SIZE.  */
    BUILD_BUG_ON(sizeof(struct shared_info) > XSI_SIZE);

    /* Kernel may be relocated by EFI loader */
    xen_pstart = ia64_tpa(KERNEL_START);

    running_on_sim = is_platform_hp_ski();

    early_setup_arch(&cmdline);

    /* We initialise the serial devices very early so we can get debugging. */
    if (running_on_sim)
        hpsim_serial_init();
    else {
        ns16550_init(0, &ns16550_com1);
        ns16550_init(1, &ns16550_com2);
    }
    serial_init_preirq();

#ifdef CONFIG_VGA
    /* Plug in a default VGA mode */
    vga_console_info.video_type = XEN_VGATYPE_TEXT_MODE_3;
    vga_console_info.u.text_mode_3.font_height = 16; /* generic VGA? */
    vga_console_info.u.text_mode_3.cursor_x =
                                        ia64_boot_param->console_info.orig_x;