Hi Bin,
On 16 March 2017 at 08:26, Bin Meng <bmeng...@gmail.com> wrote:
> In an S3 resume path, U-Boot does everything like a cold boot except
> in the last_stage_init() it jumps to the OS resume vector.
>
> Signed-off-by: Bin Meng <bmeng...@gmail.com>
> ---
>
> arch/x86/cpu/cpu.c | 8 ++++++++
> arch/x86/include/asm/acpi_s3.h | 10 ++++++++++
> arch/x86/lib/Makefile | 1 +
> arch/x86/lib/acpi_s3.c | 26 ++++++++++++++++++++++++++
> 4 files changed, 45 insertions(+)
> create mode 100644 arch/x86/lib/acpi_s3.c
Reviewed-by: Simon Glass <s...@chromium.org>
>
> diff --git a/arch/x86/cpu/cpu.c b/arch/x86/cpu/cpu.c
> index 9dde54c..afc8645 100644
> --- a/arch/x86/cpu/cpu.c
> +++ b/arch/x86/cpu/cpu.c
> @@ -26,6 +26,7 @@
> #include <malloc.h>
> #include <syscon.h>
> #include <asm/acpi_s3.h>
> +#include <asm/acpi_table.h>
> #include <asm/control_regs.h>
> #include <asm/coreboot_tables.h>
> #include <asm/cpu.h>
> @@ -204,6 +205,13 @@ __weak void board_final_cleanup(void)
>
> int last_stage_init(void)
> {
> +#if CONFIG_HAVE_ACPI_RESUME
> + void *wake_vector = acpi_find_wakeup_vector();
> +
> + if (wake_vector != NULL && gd->arch.prev_sleep_state == ACPI_S3)
> + acpi_resume(wake_vector);
> +#endif
> +
> write_tables();
>
> board_final_cleanup();
> diff --git a/arch/x86/include/asm/acpi_s3.h b/arch/x86/include/asm/acpi_s3.h
> index f9d4739..5892a8b 100644
> --- a/arch/x86/include/asm/acpi_s3.h
> +++ b/arch/x86/include/asm/acpi_s3.h
> @@ -100,6 +100,16 @@ enum acpi_sleep_state chipset_prev_sleep_state(void);
> */
> void chipset_clear_sleep_state(void);
>
> +/**
> + * acpi_resume() - Do ACPI S3 resume
> + *
> + * This calls U-Boot wake up assembly stub and jumps to OS's wake up vector.
> + *
> + * @wake_vec: OS wake up vector
> + * @return: Never returns
> + */
> +void acpi_resume(void *wake_vec);
> +
> #endif /* __ASSEMBLY__ */
>
> #endif /* __ASM_ACPI_S3_H__ */
> diff --git a/arch/x86/lib/Makefile b/arch/x86/lib/Makefile
> index 1c2c085..c61f931 100644
> --- a/arch/x86/lib/Makefile
> +++ b/arch/x86/lib/Makefile
> @@ -35,6 +35,7 @@ obj-$(CONFIG_X86_RAMTEST) += ramtest.o
> obj-y += sections.o
> obj-y += sfi.o
> obj-y += string.o
> +obj-$(CONFIG_HAVE_ACPI_RESUME) += acpi_s3.o
> ifndef CONFIG_QEMU
> obj-$(CONFIG_GENERATE_ACPI_TABLE) += acpi_table.o
> endif
> diff --git a/arch/x86/lib/acpi_s3.c b/arch/x86/lib/acpi_s3.c
> new file mode 100644
> index 0000000..f679c06
> --- /dev/null
> +++ b/arch/x86/lib/acpi_s3.c
> @@ -0,0 +1,26 @@
> +/*
> + * Copyright (C) 2017, Bin Meng <bmeng...@gmail.com>
> + *
> + * SPDX-License-Identifier: GPL-2.0+
> + */
> +
> +#include <common.h>
> +#include <asm/acpi_s3.h>
> +#include <asm/post.h>
> +
> +static void asmlinkage (*acpi_do_wakeup)(void *vector) = (void *)WAKEUP_BASE;
> +
> +static void acpi_jump_to_wakeup(void *vector)
> +{
> + /* Copy wakeup trampoline in place */
> + memcpy((void *)WAKEUP_BASE, __wakeup, __wakeup_size);
> +
> + printf("Jumping to OS waking vector %p\n", vector);
Should this be debug()?
> + acpi_do_wakeup(vector);
> +}
> +
> +void acpi_resume(void *wake_vec)
> +{
> + post_code(POST_OS_RESUME);
> + acpi_jump_to_wakeup(wake_vec);
> +}
> --
> 2.9.2
>
Regards,
Simon
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