src/paravirt.h

#ifndef __PV_H
#define __PV_H

#include "util.h"

/* This CPUID returns the signature 'KVMKVMKVM' in ebx, ecx, and edx.  It
 * should be used to determine that a VM is running under KVM.
 */
#define KVM_CPUID_SIGNATURE     0x40000000

static inline int kvm_para_available(void)
{
    unsigned int eax, ebx, ecx, edx;
    char signature[13];

    cpuid(KVM_CPUID_SIGNATURE, &eax, &ebx, &ecx, &edx);
    memcpy(signature + 0, &ebx, 4);
    memcpy(signature + 4, &ecx, 4);
    memcpy(signature + 8, &edx, 4);
    signature[12] = 0;

    if (strcmp(signature, "KVMKVMKVM") == 0)
        return 1;

    return 0;
}

#define QEMU_CFG_SIGNATURE		0x00
#define QEMU_CFG_ID			0x01
#define QEMU_CFG_UUID			0x02
#define QEMU_CFG_NUMA			0x0d
#define QEMU_CFG_BOOT_MENU		0x0e
#define QEMU_CFG_MAX_CPUS		0x0f
#define QEMU_CFG_FILE_DIR               0x19
#define QEMU_CFG_ARCH_LOCAL		0x8000
#define QEMU_CFG_ACPI_TABLES		(QEMU_CFG_ARCH_LOCAL + 0)
#define QEMU_CFG_SMBIOS_ENTRIES		(QEMU_CFG_ARCH_LOCAL + 1)
#define QEMU_CFG_IRQ0_OVERRIDE		(QEMU_CFG_ARCH_LOCAL + 2)
#define QEMU_CFG_E820_TABLE		(QEMU_CFG_ARCH_LOCAL + 3)

extern int qemu_cfg_present;

void qemu_cfg_port_probe(void);
int qemu_cfg_show_boot_menu(void);
void qemu_cfg_get_uuid(u8 *uuid);
int qemu_cfg_irq0_override(void);
u16 qemu_cfg_acpi_additional_tables(void);
u16 qemu_cfg_next_acpi_table_len(void);
void *qemu_cfg_next_acpi_table_load(void *addr, u16 len);
u16 qemu_cfg_smbios_entries(void);
size_t qemu_cfg_smbios_load_field(int type, size_t offset, void *addr);
int qemu_cfg_smbios_load_external(int type, char **p, unsigned *nr_structs,
                                  unsigned *max_struct_size, char *end);
int qemu_cfg_get_numa_nodes(void);
void qemu_cfg_get_numa_data(u64 *data, int n);
u16 qemu_cfg_get_max_cpus(void);

typedef struct QemuCfgFile {
    u32  size;        /* file size */
    u16  select;      /* write this to 0x510 to read it */
    u16  reserved;
    char name[56];
} QemuCfgFile;

struct e820_reservation {
    u64 address;
    u64 length;
    u32 type;
};

u32 qemu_cfg_next_prefix_file(const char *prefix, u32 prevselect);
u32 qemu_cfg_find_file(const char *name);
int qemu_cfg_size_file(u32 select);
const char* qemu_cfg_name_file(u32 select);
int qemu_cfg_read_file(u32 select, void *dst, u32 maxlen);

// Wrappers that select cbfs or qemu_cfg file interface.
static inline u32 romfile_findprefix(const char *prefix, u32 previd) {
    if (CONFIG_COREBOOT)
        return (u32)cbfs_findprefix(prefix, (void*)previd);
    return qemu_cfg_next_prefix_file(prefix, previd);
}
static inline u32 romfile_find(const char *name) {
    if (CONFIG_COREBOOT)
        return (u32)cbfs_finddatafile(name);
    return qemu_cfg_find_file(name);
}
static inline u32 romfile_size(u32 fileid) {
    if (CONFIG_COREBOOT)
        return cbfs_datasize((void*)fileid);
    return qemu_cfg_size_file(fileid);
}
static inline int romfile_copy(u32 fileid, void *dst, u32 maxlen) {
    if (CONFIG_COREBOOT)
        return cbfs_copyfile((void*)fileid, dst, maxlen);
    return qemu_cfg_read_file(fileid, dst, maxlen);
}
static inline const char* romfile_name(u32 fileid) {
    if (CONFIG_COREBOOT)
        return cbfs_filename((void*)fileid);
    return qemu_cfg_name_file(fileid);
}
void *romfile_loadfile(const char *name, int *psize);

u32 qemu_cfg_e820_entries(void);
void* qemu_cfg_e820_load_next(void *addr);

#endif