[v1,2/3] arm_boot: parameterized intird and dtb locations

Added fields that allows a machine model to specify where the initrd and dtb
are loaded. Leaving the fields 0 will use to old default values (previously
hardcoded in arm_boot.c)

Signed-off-by: Peter A. G. Crosthwaite <peter.crosthwaite@petalogix.com>
---
 hw/arm-misc.h |    8 ++++++++
 hw/arm_boot.c |   34 ++++++++++++++++++++--------------
 2 files changed, 28 insertions(+), 14 deletions(-)

> -----Original Message-----
> From: Peter A. G. Crosthwaite [mailto:peter.crosthwaite@petalogix.com]
> Sent: Sunday, April 01, 2012 10:20 PM
> To: peter.crosthwaite@petalogix.com; qemu-devel@nongnu.org;
> paul@codesourcery.com; peter.maydell@linaro.org;
> edgar.iglesias@gmail.com
> Cc: Duy Le; John Linn; john.williams@petalogix.com
> Subject: [PATCH v1 2/3] arm_boot: parameterized intird and dtb
> locations
> 
> Added fields that allows a machine model to specify where the initrd
> and dtb
> are loaded. Leaving the fields 0 will use to old default values
> (previously
> hardcoded in arm_boot.c)
> 
> Signed-off-by: Peter A. G. Crosthwaite
> <peter.crosthwaite@petalogix.com>

Signed-off-by: John Linn <john.linn@xilinx.com>

> ---
>  hw/arm-misc.h |    8 ++++++++
>  hw/arm_boot.c |   34 ++++++++++++++++++++--------------
>  2 files changed, 28 insertions(+), 14 deletions(-)
> 
> diff --git a/hw/arm-misc.h b/hw/arm-misc.h
> index 2f46e21..25f3da8 100644
> --- a/hw/arm-misc.h
> +++ b/hw/arm-misc.h
> @@ -31,6 +31,14 @@ struct arm_boot_info {
>      const char *initrd_filename;
>      const char *dtb_filename;
>      target_phys_addr_t loader_start;
> +    /* where to place the initrd relative to loader start. A value of
> 0
> +     * will select the default value of loader_start + 0xd00000.
> +     */
> +    target_phys_addr_t initrd_offset;
> +    /* where to place the dtb relative to loader start. A value of 0
> will
> +     * place it immediately after the initrd (page aligned).
> +     */
> +    target_phys_addr_t dtb_offset;
>      /* multicore boards that use the default secondary core boot
> functions
>       * need to put the address of the secondary boot code, the boot
> reg,
>       * and the GIC address in the next 3 values, respectively. boards
> that
> diff --git a/hw/arm_boot.c b/hw/arm_boot.c
> index 7447f5c..302bd17 100644
> --- a/hw/arm_boot.c
> +++ b/hw/arm_boot.c
> @@ -18,7 +18,8 @@
> 
>  #define KERNEL_ARGS_ADDR 0x100
>  #define KERNEL_LOAD_ADDR 0x00010000
> -#define INITRD_LOAD_ADDR 0x00d00000
> +
> +#define DEFAULT_INITRD_OFFSET 0x00d00000
> 
>  /* The worlds second smallest bootloader.  Set r0-r2, then jump to
> kernel.  */
>  static uint32_t bootloader[] = {
> @@ -107,7 +108,7 @@ static void set_kernel_args(const struct
> arm_boot_info *info)
>          /* ATAG_INITRD2 */
>          WRITE_WORD(p, 4);
>          WRITE_WORD(p, 0x54420005);
> -        WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
> +        WRITE_WORD(p, info->loader_start + info->initrd_offset);
>          WRITE_WORD(p, initrd_size);
>      }
>      if (info->kernel_cmdline && *info->kernel_cmdline) {
> @@ -184,7 +185,7 @@ static void set_kernel_args_old(const struct
> arm_boot_info *info)
>      WRITE_WORD(p, 0);
>      /* initrd_start */
>      if (initrd_size)
> -        WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
> +        WRITE_WORD(p, info->loader_start + info->initrd_offset);
>      else
>          WRITE_WORD(p, 0);
>      /* initrd_size */
> @@ -211,7 +212,7 @@ static void set_kernel_args_old(const struct
> arm_boot_info *info)
>      }
>  }
> 
> -static int load_dtb(target_phys_addr_t addr, const struct
> arm_boot_info *binfo)
> +static int load_dtb(const struct arm_boot_info *binfo)
>  {
>  #ifdef CONFIG_FDT
>      uint32_t mem_reg_property[] = { cpu_to_be32(binfo->loader_start),
> @@ -248,20 +249,21 @@ static int load_dtb(target_phys_addr_t addr,
> const struct arm_boot_info *binfo)
> 
>      if (binfo->initrd_size) {
>          rc = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-
> start",
> -                binfo->loader_start + INITRD_LOAD_ADDR);
> +                binfo->loader_start + binfo->initrd_offset);
>          if (rc < 0) {
>              fprintf(stderr, "couldn't set /chosen/linux,initrd-
> start\n");
>          }
> 
>          rc = qemu_devtree_setprop_cell(fdt, "/chosen", "linux,initrd-
> end",
> -                    binfo->loader_start + INITRD_LOAD_ADDR +
> +                    binfo->loader_start + binfo->initrd_offset +
>                      binfo->initrd_size);
>          if (rc < 0) {
>              fprintf(stderr, "couldn't set /chosen/linux,initrd-
> end\n");
>          }
>      }
> 
> -    cpu_physical_memory_write(addr, fdt, size);
> +    cpu_physical_memory_write(binfo->loader_start +
binfo->dtb_offset,
> +                                                                fdt,
> size);
> 
>      return 0;
> 
> @@ -362,10 +364,13 @@ void arm_load_kernel(CPUARMState *env, struct
> arm_boot_info *info)
>      info->entry = entry;
>      if (is_linux) {
>          if (info->initrd_filename) {
> +            if (!info->initrd_offset) {
> +                info->initrd_offset = DEFAULT_INITRD_OFFSET;
> +            }
>              initrd_size = load_image_targphys(info->initrd_filename,
>                                                info->loader_start
> -                                              + INITRD_LOAD_ADDR,
> -                                              ram_size -
> INITRD_LOAD_ADDR);
> +                                              + info->initrd_offset,
> +                                              ram_size - info-
> >initrd_offset);
>              if (initrd_size < 0) {
>                  fprintf(stderr, "qemu: could not load initrd '%s'\n",
>                          info->initrd_filename);
> @@ -382,14 +387,15 @@ void arm_load_kernel(CPUARMState *env, struct
> arm_boot_info *info)
>           * we point to the kernel args.
>           */
>          if (info->dtb_filename) {
> -            /* Place the DTB after the initrd in memory */
> -            target_phys_addr_t dtb_start = TARGET_PAGE_ALIGN(info-
> >loader_start
> -                                                             +
> INITRD_LOAD_ADDR
> +            if (!info->dtb_offset) {
> +                /* Place the DTB after the initrd in memory */
> +                info->dtb_offset = TARGET_PAGE_ALIGN(info-
> >initrd_offset
>                                                               +
> initrd_size);
> -            if (load_dtb(dtb_start, info)) {
> +            }
> +            if (load_dtb(info)) {
>                  exit(1);
>              }
> -            bootloader[5] = dtb_start;
> +            bootloader[5] = info->loader_start + info->dtb_offset;
>          } else {
>              bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
>          }
> --
> 1.7.3.2
> 


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