Re: [Qemu-devel] [PATCH v2 03/10] target-mips: get_physical_address: Add defines for segment bases

[Aurelien Jarno <aurelien@aurel32.net>]

On Mon, Dec 16, 2013 at 02:12:38PM +0000, James Hogan wrote:
> Add preprocessor definitions for 32bit segment bases for use in
> get_physical_address(). These will also be taken advantage of in the
> next patch which adds KVM awareness.
> 
> Signed-off-by: James Hogan <james.hogan@imgtec.com>
> Cc: Aurelien Jarno <aurelien@aurel32.net>
> ---
>  target-mips/helper.c | 18 ++++++++++++------
>  1 file changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/target-mips/helper.c b/target-mips/helper.c
> index 33e0e88..2e96655 100644
> --- a/target-mips/helper.c
> +++ b/target-mips/helper.c
> @@ -118,7 +118,13 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
>      qemu_log("user mode %d h %08x\n", user_mode, env->hflags);
>  #endif
>  
> -    if (address <= (int32_t)0x7FFFFFFFUL) {
> +#define USEG_LIMIT      0x7FFFFFFFUL
> +#define KSEG0_BASE      0x80000000UL
> +#define KSEG1_BASE      0xA0000000UL
> +#define KSEG2_BASE      0xC0000000UL
> +#define KSEG3_BASE      0xE0000000UL
> +
> +    if (address <= USEG_LIMIT) {
>          /* useg */
>          if (env->CP0_Status & (1 << CP0St_ERL)) {
>              *physical = address & 0xFFFFFFFF;
> @@ -160,23 +166,23 @@ static int get_physical_address (CPUMIPSState *env, hwaddr *physical,
>              ret = TLBRET_BADADDR;
>          }
>  #endif
> -    } else if (address < (int32_t)0xA0000000UL) {
> +    } else if (address < (int32_t)KSEG1_BASE) {
>          /* kseg0 */
>          if (kernel_mode) {
> -            *physical = address - (int32_t)0x80000000UL;
> +            *physical = address - (int32_t)KSEG0_BASE;
>              *prot = PAGE_READ | PAGE_WRITE;
>          } else {
>              ret = TLBRET_BADADDR;
>          }
> -    } else if (address < (int32_t)0xC0000000UL) {
> +    } else if (address < (int32_t)KSEG2_BASE) {
>          /* kseg1 */
>          if (kernel_mode) {
> -            *physical = address - (int32_t)0xA0000000UL;
> +            *physical = address - (int32_t)KSEG1_BASE;
>              *prot = PAGE_READ | PAGE_WRITE;
>          } else {
>              ret = TLBRET_BADADDR;
>          }
> -    } else if (address < (int32_t)0xE0000000UL) {
> +    } else if (address < (int32_t)KSEG3_BASE) {
>          /* sseg (kseg2) */
>          if (supervisor_mode || kernel_mode) {
>              ret = env->tlb->map_address(env, physical, prot, address, rw, access_type);

Reviewed-by: Aurelien Jarno <aurelien@aurel32.net>

-- 
Aurelien Jarno                          GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net