Re: [Qemu-devel] Re: [PATCH 0/3]: Add UUID command-line option

[Gleb Natapov]

> Here's a patch implementing a configuration ROM (probably in a bad
> address) including a fake UUID. I skipped the more difficult parts
> like kernel address etc.
I haven't seen any comments on this. Anthony, is this approach
acceptable?

> Index: qemu/hw/pc.c
> ===================================================================
> --- qemu.orig/hw/pc.c 2008-07-30 16:58:03.000000000 +0000
> +++ qemu/hw/pc.c      2008-07-30 17:24:01.000000000 +0000
> @@ -32,6 +32,7 @@
>  #include "smbus.h"
>  #include "boards.h"
>  #include "console.h"
> +#include "firmware_abi.h"
>  
>  /* output Bochs bios info messages */
>  //#define DEBUG_BIOS
> @@ -41,6 +42,8 @@
>  #define VGABIOS_CIRRUS_FILENAME "vgabios-cirrus.bin"
>  
>  #define PC_MAX_BIOS_SIZE (4 * 1024 * 1024)
> +#define PC_CFG_ROM_ADDR 0xf0000000
> +#define PC_CFG_ROM_SIZE 4096
>  
>  /* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables.  */
>  #define ACPI_DATA_SIZE       0x10000
> @@ -712,6 +715,55 @@
>      nb_ne2k++;
>  }
>  
> +static int pc_cfg_rom_set_params(ram_addr_t cfg_rom,
> +                                 const char *arch,
> +                                 ram_addr_t below_4g_mem_size,
> +                                 ram_addr_t above_4g_mem_size,
> +                                 const char *boot_devices)
> +{
> +    uint32_t start;
> +    uint8_t image[PC_CFG_ROM_SIZE];
> +    ohwcfg_v3_t *header = (ohwcfg_v3_t *)ℑ
> +    struct pc_arch_cfg *pc_header;
> +    extern int nographic;
> +
> +    memset(image, '\0', sizeof(image));
> +
> +    // Try to match PPC NVRAM
> +    strcpy((char *)header->struct_ident, "QEMU_BIOS");
> +    header->struct_version = cpu_to_le32(3); /* structure v3 */
> +
> +    header->nvram_arch_ptr = cpu_to_le16(sizeof(ohwcfg_v3_t));
> +    header->nvram_arch_size = cpu_to_le16(sizeof(struct pc_arch_cfg));
> +    strcpy((char *)header->arch, arch);
> +    header->nb_cpus = smp_cpus & 0xff;
> +    header->RAM0_base = 0;
> +    header->RAM0_size = cpu_to_le64((uint64_t)below_4g_mem_size);
> +    if (above_4g_mem_size) {
> +        header->RAM1_base = 0x100000000ULL;
> +        header->RAM1_size = cpu_to_le64((uint64_t)above_4g_mem_size);
> +    }
> +    strcpy((char *)header->boot_devices, boot_devices);
> +    header->nboot_devices = strlen(boot_devices) & 0xff;
> +
> +    if (nographic)
> +        header->graphic_flags = cpu_to_le16(OHW_GF_NOGRAPHICS);
> +
> +    strncpy((char *)header->uuid, "QEMUQEMUQEMUQEMU", 16);
> +
> +    header->crc = cpu_to_le16(OHW_compute_crc(header, 0x00, 0xF8));
> +
> +    // Architecture specific header
> +    start = sizeof(ohwcfg_v3_t);
> +    pc_header = (struct pc_arch_cfg *)&image[start];
> +    pc_header->valid = 1;
> +    start += sizeof(struct pc_arch_cfg);
> +
> +    cpu_physical_memory_write_rom(cfg_rom, image, sizeof(image));
> +
> +    return 0;
> +}
> +
>  /* PC hardware initialisation */
>  static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
>                       const char *boot_device, DisplayState *ds,
> @@ -723,6 +775,7 @@
>      int ret, linux_boot, i;
>      ram_addr_t ram_addr, vga_ram_addr, bios_offset, vga_bios_offset;
>      ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
> +    ram_addr_t cfg_rom_offset;
>      int bios_size, isa_bios_size, vga_bios_size;
>      PCIBus *pci_bus;
>      int piix3_devfn = -1;
> @@ -867,6 +920,14 @@
>      cpu_register_physical_memory((uint32_t)(-bios_size),
>                                   bios_size, bios_offset | IO_MEM_ROM);
>  
> +    /* map configuration ROM */
> +    cfg_rom_offset = qemu_ram_alloc(PC_CFG_ROM_SIZE);
> +    cpu_register_physical_memory(PC_CFG_ROM_ADDR, PC_CFG_ROM_SIZE,
> +                                 cfg_rom_offset | IO_MEM_ROM);
> +    pc_cfg_rom_set_params(PC_CFG_ROM_ADDR, pci_enabled? "pc" : "isapc",
> +                          below_4g_mem_size, above_4g_mem_size,
> +                          boot_device);
> +
>      bochs_bios_init();
>  
>      if (linux_boot)
> Index: qemu/hw/firmware_abi.h
> ===================================================================
> --- qemu.orig/hw/firmware_abi.h       2008-07-30 16:57:53.000000000 +0000
> +++ qemu/hw/firmware_abi.h    2008-07-30 17:22:12.000000000 +0000
> @@ -54,8 +54,10 @@
>      uint8_t  pad3[5];
>      /* 0xD0: boot devices                            */
>      uint8_t  boot_devices[0x10];
> -    /* 0xE0                                          */
> -    uint8_t  pad4[0x1C]; /* 28 */
> +    /* 0xE0: UUID                                    */
> +    uint8_t  uuid[0x10];
> +    /* 0xF0                                          */
> +    uint8_t  pad4[0xC]; /* 12 */
>      /* 0xFC: checksum                                */
>      uint16_t crc;
>      uint8_t  pad5[0x02];
> @@ -176,6 +178,12 @@
>      header->checksum = tmp;
>  }
>  
> +/* PC configuration structure */
> +struct pc_arch_cfg {
> +    uint8_t valid;
> +    uint8_t unused[63];
> +};
> +
>  #else /* __ASSEMBLY__ */
>  
>  /* Structure offsets for asm use */
> Index: qemu/hw/sun4m.c
> ===================================================================
> --- qemu.orig/hw/sun4m.c      2008-07-30 17:24:14.000000000 +0000
> +++ qemu/hw/sun4m.c   2008-07-30 17:24:56.000000000 +0000
> @@ -213,6 +213,8 @@
>      if (nographic)
>          header->graphic_flags = cpu_to_be16(OHW_GF_NOGRAPHICS);
>  
> +    strncpy((char *)header->uuid, "QEMUQEMUQEMUQEMU", 16);
> +
>      header->crc = cpu_to_be16(OHW_compute_crc(header, 0x00, 0xF8));
>  
>      // Architecture specific header
> Index: qemu/hw/sun4u.c
> ===================================================================
> --- qemu.orig/hw/sun4u.c      2008-07-30 17:24:16.000000000 +0000
> +++ qemu/hw/sun4u.c   2008-07-30 17:24:33.000000000 +0000
> @@ -144,6 +144,8 @@
>      if (nographic)
>          header->graphic_flags = cpu_to_be16(OHW_GF_NOGRAPHICS);
>  
> +    strncpy((char *)header->uuid, "QEMUQEMUQEMUQEMU", 16);
> +
>      header->crc = cpu_to_be16(OHW_compute_crc(header, 0x00, 0xF8));
>  
>      // Architecture specific header


--
                        Gleb.