131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
#include <internals/gint.h>
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#include <internals/interrupt_maps.h>
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#include <internals/modules.h>
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#include <gint.h>
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#include <mpu.h>
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gint_info_t gint;
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static environment_t env;
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//---
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// Initialization routines
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//---
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/*
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gint_init()
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Initializes gint. Loads the interrupt handler into the memory and sets
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the new vbr address.
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*/
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static void setup(void)
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{
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isSH3() ? gint_lock_and_setup_7705()
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: gint_lock_and_setup_7305();
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}
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void gint_init(mpu_t mpu)
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{
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// Setting the MPU type. I don't like const-casting but this is still
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// better than allowing the user to change the variable by mistake.
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*((mpu_t *)&MPU_CURRENT) = mpu;
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// Loading the register addresses of the current platform.
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mod_init();
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// Linker script symbols -- gint.
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extern uint32_t
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gint_vbr,
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gint_data,
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bgint, egint;
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uint32_t *ptr = &bgint;
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uint32_t *src = &gint_data;
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// Loading the interrupt handler into the memory.
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while(ptr < &egint) *ptr++ = *src++;
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isSH3() ? gint_save_7705(&env.env_7705)
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: gint_save_7305(&env.env_7305);
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// Installing gint's default exception/interrupt handlers.
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for(int i = 0; i < exc_type_max; i++)
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{
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gint_handlers[i].function = gint_handlers[i].default_function;
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}
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// Filling the information structure for the user.
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gint.vbr = gint_getvbr;
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gint.system_vbr = gint_getvbr();
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gint.gint_vbr = (uint32_t)&gint_vbr;
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// Setting the VBR!
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gint_setvbr(gint.gint_vbr, setup);
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}
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//---
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// Context restoration routines
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//---
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/*
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gint_quit()
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Stops gint. Restores the system's configuration and vbr address.
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*/
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static void stop(void)
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{
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isSH3() ? gint_restore_and_unlock_7705(&env.env_7705)
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: gint_restore_and_unlock_7305(&env.env_7305);
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}
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void gint_quit(void)
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{
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// Restoring the system's VBR.
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gint_setvbr(gint.system_vbr, stop);
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}
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//---
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// System-switch technique
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//---
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#include <display.h>
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#include <gray.h>
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/*
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__system_menu()
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Updates the system's vram and triggers the calculator's main menu.
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*/
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void __system_menu(void *vram);
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// Stores gint's configuration while the user visits the main menu.
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static environment_t switch_env;
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/*
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gint_switch()
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Temporarily returns to the system's main menu.
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*/
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static void restore(void)
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{
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isSH3() ? gint_restore_and_unlock_7705(&switch_env.env_7705)
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: gint_restore_and_unlock_7305(&switch_env.env_7305);
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}
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void gint_switch(void)
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{
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isSH3() ? gint_save_7705(&switch_env.env_7705)
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: gint_save_7305(&switch_env.env_7305);
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gint_setvbr(gint.system_vbr, stop);
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// When returning to the add-in from the menu, the system displays the
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// add-in's video ram again, but it's often blank. We thus need to copy
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// the contents of the gint video ram to the system's.
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void *vram = gray_runs()
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? gray_currentVRAM()
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: display_getCurrentVRAM();
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// Use system calls to put KEY_MENU in the key buffer and invoke
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// GetKeyWait(), triggering the main menu.
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__system_menu(vram);
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// If the user came back, restore the gint working environment.
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gint_setvbr(gint.gint_vbr, restore);
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}
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