[v3,07/14] hw/arm_boot.c: Add new secondary CPU bootloader.

Secondary CPU bootloader enables interrupt and issues wfi until start address
is written to system controller. The position where to find this start
address is hardcoded to 0x10000030. This commit adds new bootloader for
secondary CPU which allows a target board to cpecify a position where
to find start address. If target board doesn't specify start address then
default 0x10000030 is used

Signed-off-by: Evgeny Voevodin <e.voevodin@samsung.com>
---
 hw/arm-misc.h |    1 +
 hw/arm_boot.c |   22 +++++++++++++++-------
 2 files changed, 16 insertions(+), 7 deletions(-)

On 12 December 2011 06:43, Evgeny Voevodin <e.voevodin@samsung.com> wrote:
> Secondary CPU bootloader enables interrupt and issues wfi until start address
> is written to system controller. The position where to find this start
> address is hardcoded to 0x10000030. This commit adds new bootloader for
> secondary CPU which allows a target board to cpecify a position where
> to find start address. If target board doesn't specify start address then
> default 0x10000030 is used

This commit message isn't quite right. We aren't adding a new bootloader,
we're modifying the existing one.

>
> Signed-off-by: Evgeny Voevodin <e.voevodin@samsung.com>
> ---
>  hw/arm-misc.h |    1 +
>  hw/arm_boot.c |   22 +++++++++++++++-------
>  2 files changed, 16 insertions(+), 7 deletions(-)
>
> diff --git a/hw/arm-misc.h b/hw/arm-misc.h
> index af403a1..6e8ae6b 100644
> --- a/hw/arm-misc.h
> +++ b/hw/arm-misc.h
> @@ -31,6 +31,7 @@ struct arm_boot_info {
>     const char *initrd_filename;
>     target_phys_addr_t loader_start;
>     target_phys_addr_t smp_loader_start;
> +    target_phys_addr_t smp_bootreg_addr;
>     target_phys_addr_t smp_priv_base;
>     int nb_cpus;
>     int board_id;
> diff --git a/hw/arm_boot.c b/hw/arm_boot.c
> index 215d5de..ecaac22 100644
> --- a/hw/arm_boot.c
> +++ b/hw/arm_boot.c
> @@ -31,17 +31,17 @@ static uint32_t bootloader[] = {
>  /* Entry point for secondary CPUs.  Enable interrupt controller and
>    Issue WFI until start address is written to system controller.  */
>  static uint32_t smpboot[] = {
> -  0xe59f0020, /* ldr     r0, privbase */
> -  0xe3a01001, /* mov     r1, #1 */
> -  0xe5801100, /* str     r1, [r0, #0x100] */
> -  0xe3a00201, /* mov     r0, #0x10000000 */
> -  0xe3800030, /* orr     r0, #0x30 */
> +  0xe59f201c, /* ldr r2, privbase */
> +  0xe59f001c, /* ldr r0, startaddr */
> +  0xe3a01001, /* mov r1, #1 */
> +  0xe5821100, /* str r1, [r2, #256] */
>   0xe320f003, /* wfi */
>   0xe5901000, /* ldr     r1, [r0] */
>   0xe1110001, /* tst     r1, r1 */
>   0x0afffffb, /* beq     <wfi> */
>   0xe12fff11, /* bx      r1 */
> -  0 /* privbase: Private memory region base address.  */
> +  0,          /* privbase: Private memory region base address.  */
> +  0           /* bootreg: Boot register address is hold here */

"held"

>  };
>
>  #define WRITE_WORD(p, value) do { \
> @@ -179,6 +179,7 @@ static void do_cpu_reset(void *opaque)
>  {
>     CPUState *env = opaque;
>     const struct arm_boot_info *info = env->boot_info;
> +    uint8_t smp_bootreg_addr[4] = {0};
>
>     cpu_reset(env);
>     if (info) {
> @@ -197,6 +198,8 @@ static void do_cpu_reset(void *opaque)
>                                     info->loader_start);
>                 }
>             } else {
> +                cpu_physical_memory_rw(info->smp_bootreg_addr, smp_bootreg_addr,
> +                        sizeof(smp_bootreg_addr), 1);

Any reason not to use WRITE_WORD() ?

>                 env->regs[15] = info->smp_loader_start;
>             }
>         }
> @@ -262,6 +265,7 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
>         } else {
>             initrd_size = 0;
>         }
> +
>         bootloader[1] |= info->board_id & 0xff;
>         bootloader[2] |= (info->board_id >> 8) & 0xff;
>         bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;

Stray whitespace change, please remove from patch.

> @@ -272,7 +276,11 @@ void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
>         rom_add_blob_fixed("bootloader", bootloader, sizeof(bootloader),
>                            info->loader_start);
>         if (info->nb_cpus > 1) {
> -            smpboot[10] = info->smp_priv_base;
> +            if (!info->smp_bootreg_addr) {
> +                info->smp_bootreg_addr = 0x10000030;
> +            }
> +            smpboot[(sizeof(smpboot) - 8)/4] = info->smp_priv_base;
> +            smpboot[(sizeof(smpboot) - 4)/4] = info->smp_bootreg_addr;

smpboot[ARRAY_SIZE(smpboot) - 1] = ...

>             for (n = 0; n < sizeof(smpboot) / 4; n++) {
>                 smpboot[n] = tswap32(smpboot[n]);
>             }
> --
> 1.7.4.1

-- PMM