target-mips: Add initrd support for the Boston board

From: Aleksandar Rikalo <aleksandar.rikalo@mips.com>

Add support for initial ramdisk loading for the Mips Boston board.

Signed-off-by: Aleksandar Rikalo <aleksandar.rikalo@mips.com>
---
 hw/mips/boston.c | 54 +++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 45 insertions(+), 9 deletions(-)

Hi Aleksandar,

On 03/14/2018 04:17 PM, Aleksandar Rikalo wrote:
> From: Aleksandar Rikalo <aleksandar.rikalo@mips.com>
> 
> Add support for initial ramdisk loading for the Mips Boston board.
> 
> Signed-off-by: Aleksandar Rikalo <aleksandar.rikalo@mips.com>
> ---
>  hw/mips/boston.c | 54 +++++++++++++++++++++++++++++++++++++++++++++---------
>  1 file changed, 45 insertions(+), 9 deletions(-)
> 
> diff --git a/hw/mips/boston.c b/hw/mips/boston.c
> index fb23161..67ca54f 100644
> --- a/hw/mips/boston.c
> +++ b/hw/mips/boston.c
> @@ -30,6 +30,7 @@
>  #include "hw/loader-fit.h"
>  #include "hw/mips/cps.h"
>  #include "hw/mips/cpudevs.h"
> +#include "hw/mips/mips.h"
>  #include "hw/pci-host/xilinx-pcie.h"
>  #include "qapi/error.h"
>  #include "qemu/cutils.h"
> @@ -333,10 +334,12 @@ static const void *boston_fdt_filter(void *opaque, const void *fdt_orig,
>  {
>      BostonState *s = BOSTON(opaque);
>      MachineState *machine = s->mach;
> -    const char *cmdline;
> +    GString *cmdline;
>      int err;
>      void *fdt;
>      size_t fdt_sz, ram_low_sz, ram_high_sz;
> +    long initrd_size;

       target_ulong initrd_size;

> +    ram_addr_t initrd_offset;
>  
>      fdt_sz = fdt_totalsize(fdt_orig) * 2;
>      fdt = g_malloc0(fdt_sz);
> @@ -347,20 +350,53 @@ static const void *boston_fdt_filter(void *opaque, const void *fdt_orig,
>          return NULL;
>      }
>  
> -    cmdline = (machine->kernel_cmdline && machine->kernel_cmdline[0])
> -            ? machine->kernel_cmdline : " ";
> -    err = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline);
> -    if (err < 0) {
> -        fprintf(stderr, "couldn't set /chosen/bootargs\n");
> -        return NULL;
> -    }
> -
>      ram_low_sz = MIN(256 * M_BYTE, machine->ram_size);
>      ram_high_sz = machine->ram_size - ram_low_sz;
>      qemu_fdt_setprop_sized_cells(fdt, "/memory@0", "reg",
>                                   1, 0x00000000, 1, ram_low_sz,
>                                   1, 0x90000000, 1, ram_high_sz);
>  
> +    cmdline = g_string_new(machine->kernel_cmdline);
> +
> +    /* load initrd */
> +    initrd_offset = 0;
> +    if (machine->initrd_filename) {
> +        initrd_size = get_image_size(machine->initrd_filename);
> +        if (initrd_size > 0) {
> +            /* The kernel allocates the bootmap memory in the low memory after
> +               the initrd.  It takes at most 128kiB for 2GB RAM and 4kiB
> +               pages.  */
> +            initrd_offset = (ram_low_sz - initrd_size - 131072
> +                             - ~INITRD_PAGE_MASK) & INITRD_PAGE_MASK;
> +
> +            if ((int64_t)cpu_mips_kseg0_to_phys(NULL, *load_addr + fdt_sz)
> +                >= (int64_t)initrd_offset) {
> +                error_report("memory too small for initial ram disk '%s'",
> +                             machine->initrd_filename);
> +                exit(1);
> +            }
> +
> +            initrd_size = load_image_targphys(machine->initrd_filename,
> +                                              initrd_offset,
> +                                              initrd_size);
> +        }
> +        if (initrd_size == (target_ulong) -1) {
> +            error_report("could not load initial ram disk '%s'",
> +                         machine->initrd_filename);
> +            exit(1);
> +        }
> +        g_string_append_printf(cmdline, " rd_start=0x%" PRIx64 " rd_size=%li",
> +                               cpu_mips_phys_to_kseg0(NULL, initrd_offset),
> +                               initrd_size);
> +    }
> +
> +    err = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", cmdline->str);
> +    g_string_free(cmdline, true);
> +    if (err < 0) {
> +        fprintf(stderr, "couldn't set /chosen/bootargs\n");

While here, please remove the fprintf():

           error_report("couldn't set /chosen/bootargs");

> +        return NULL;
> +    }
> +
>      fdt = g_realloc(fdt, fdt_totalsize(fdt));
>      qemu_fdt_dumpdtb(fdt, fdt_sz);
>  
> 

With comment addressed:
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

Regards,

Phil.