On Tue, Jun 02, 2009 at 11:31:42PM +0800, wuzhangjin@xxxxxxxxx wrote:
> diff --git a/arch/mips/power/cpu.c b/arch/mips/power/cpu.c
> new file mode 100644
> index 0000000..5fe43e5
> --- /dev/null
> +++ b/arch/mips/power/cpu.c
> @@ -0,0 +1,31 @@
> +/*
> + * Suspend support specific for mips.
> + *
> + */
> +#include <linux/mm.h>
> +#include <linux/suspend.h>
> +#include <asm/mipsregs.h>
> +#include <asm/page.h>
> +#include <asm/suspend.h>
> +#include <asm/ptrace.h>
> +
> +static uint32_t saved_status;
> +struct pt_regs saved_regs;
> +
> +void save_processor_state(void)
> +{
> + saved_status = read_c0_status();
> +}
> +
> +void restore_processor_state(void)
> +{
> + write_c0_status(saved_status);
> +}
> +
> +int pfn_is_nosave(unsigned long pfn)
> +{
> + unsigned long nosave_begin_pfn = PFN_DOWN(__pa(&__nosave_begin));
> + unsigned long nosave_end_pfn = PFN_UP(__pa(&__nosave_end));
> +
> + return (pfn >= nosave_begin_pfn) && (pfn < nosave_end_pfn);
> +}
I'm missing FPU handling here.
> diff --git a/arch/mips/power/hibernate.S b/arch/mips/power/hibernate.S
> new file mode 100644
> index 0000000..4ca9149
> --- /dev/null
> +++ b/arch/mips/power/hibernate.S
> @@ -0,0 +1,67 @@
> +#incldue <linux/linkage.h>
> +#include <asm/asm-offsets.h>
> +#include <asm/regdef.h>
> +#include <asm/asm.h>
> +
> + .extern __flush_cache_all
> +#ifdef CONFIG_SMP
> + .extern flush_tlb_all
> +#else
> + .extern local_flush_tlb_all
> +#define flush_tlb_all local_flush_tlb_all
> +#endif
For ease of maintenance, could you do these flushes from C code and only
do the bits that absolutely must be done in assembler, in assembler?
> + /* flush caches to make sure context is in memory */
> + PTR_L t0, __flush_cache_all
> + jalr t0
> + /* flush tlb entries */
> + PTR_LA t0, flush_tlb_all
In addition to the above said - there is no PTR_L JALR sequence needed here
because this code is never compiled as a loadable module. So a jal would
do the job.
All in all this is looking much better than the first version!
Ralf
