forked from Lephenixnoir/gint
101 lines
2.5 KiB
C
101 lines
2.5 KiB
C
#ifndef _INTERRUPT_MAPS
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#define _INTERRUPT_MAPS
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#include <stdint.h>
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#include <internals/gint.h>
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//---
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// Interrupt handlers.
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//---
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/*
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gint_interrupt_arg_t
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8-bit integer representing an argument to pass as uint32_t to an
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exception or interrupt handler.
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*/
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typedef enum
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{
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// Empty argument (always at end of list).
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arg_none = 0x00,
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// Signal subtype (f.i address error subtypes: code, read, write).
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arg_subtype = 0x01,
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// Value of register SPC is passed.
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arg_pc = 0x02,
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// Instruction pointed at by SPC is passed (re-execution types).
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arg_opcode = 0x03,
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// Address indicated in register TEA is passed.
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arg_tea = 0x04,
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// Trap number is passed.
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arg_trap = 0x05,
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// Timer channel 2 captured input (SH7705 only).
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arg_timer_capt = 0x06,
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} gint_interrupt_arg_t;
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/*
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gint_interrupt_handler_t
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Contains both static and dynamic information of interrupt handlers:
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the current handler is stored there, as well as the type signature
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information through an array of parameters.
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*/
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typedef struct
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{
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// Current handler function. The type signature may vary, hence the
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// void * pointer.
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void *function;
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// Default handler and fallback if the current handler is un-installed.
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void *default_function;
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// Default interrupt priorities (interrupts only).
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uint8_t priority;
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// Arguments passed to the handler (these are values of type arg_t).
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// This array is the only thing that defines the type signature of the
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// two functions above.
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uint8_t args[3];
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} gint_interrupt_handler_t;
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// Handler array.
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extern gint_interrupt_handler_t gint_handlers[];
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//---
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// Interrupt maps.
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//---
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/*
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gint_interrupt_map_t
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Maps an event code to an interrupt type and subtype. The subtypes allow
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group-handling similar interrupts (for instance TLB misses for code and
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data accesses, or timer underflows from various channels).
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*/
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typedef struct
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{
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uint8_t type;
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uint8_t subtype;
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} __attribute__((packed)) gint_interrupt_map_t;
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/*
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gint_map_7705()
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TLB misses and TLB invalid have the same event code though they are
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handled by different functions in the VBR space. The offset argument
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expects values 0x100, 0x400 or 0x600 to distinguish between them.
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*/
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gint_interrupt_map_t gint_map_7705(uint32_t event_code, uint32_t offset);
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/*
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gint_map_7305()
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Maps an event code to an interrupt type. The SH7305 does not have TLB
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invalid exceptions so no event codes overlap.
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*/
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gint_interrupt_map_t gint_map_7305(uint32_t event_code);
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/*
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gint_invoke()
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Invokes an interrupt or exception handler, given its type and subtype.
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*/
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void gint_invoke(uint8_t type, uint8_t subtype);
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#endif // _INTERRUPT_MAPS
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