88 lines
2.1 KiB
C
88 lines
2.1 KiB
C
//---
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// gint:core:mpu - Runtime MPU detection
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//
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// This component detects the architecture and MPU type of the underlying
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// hardware by relying on version registers and/or side-information. It
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// provides macros isSH3() and isSH4() for MPU-dependent jobs
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//
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// if(isSH3()) print("SH3 code");
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// else print("SH4 code");
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//---
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#ifndef GINT_CORE_MPU
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#define GINT_CORE_MPU
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#include <gint/defs/types.h>
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/* mpu_t - supported MPUs */
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typedef enum
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{
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mpu_unknown = 0,
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mpu_sh7337 = 1, /* fx9860g, SH-3 based */
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mpu_sh7305 = 2, /* fx9860g II, fxcg50, SH-4A based */
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mpu_sh7355 = 3, /* fx9860g II, SH-3 based */
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mpu_sh7724 = 4, /* For reference */
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} mpu_t;
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/* On fx9860g, the 256k byte RAM might be extended to 512k if the machine is
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recent enough. This includes all SH4 and many SH3 fx-9750 GII; the only
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model known to not have it is the old fx-9860G. */
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#ifdef FX9860G
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typedef struct
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{
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/* MPU type, one of the above values */
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mpu_t mpu;
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/* Extended RAM area (8804'0000:256k) is available */
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int extended_ram;
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} platform_t;
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/* mpu_id() - get the name of the underlying MPU */
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#define gint_mpu() (gint_platform.mpu)
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/* Quick SH-3/SH-4 tests. Unknown models are assumed to be SH-4A */
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#define isSH3() (gint_mpu() & 1)
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#define isSH4() (!isSH3())
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#endif /* FX9860G */
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/* On fxcg50, the processor is always SH4. We can still differentiate between
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modern fx-CG 50 and older fx-CG 10/20 which are called here "Prizm". (This
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is done by observing the initial stack pointer.) */
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#ifdef FXCG50
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typedef struct
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{
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/* MPU type (always sh7305) */
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mpu_t mpu;
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/* Whether this is an fx-CG 10/20 Prizm instead of an fx-CG 50 */
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int prizm;
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} platform_t;
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/* All fxcg50 machines have an SH7305, which makes things simpler. */
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#define gint_mpu() mpu_sh7305
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#define isSH3() 0
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#define isSH4() 1
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#endif /* FX9860G */
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/* Platform details collected by mpu_init() */
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extern const platform_t gint_platform;
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/* mpu_init() - detect hardware information
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This function must be executed before other functions of this header can be
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used successfully.
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@stack Starting stack address (roughly is enough) */
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void mpu_init(uint32_t stack);
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#endif /* GINT_CORE_MPU */
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