//---
//	gint:core:kernel - Installing and unloading the library
//---

#include <gint/mmu.h>
#include <gint/drivers.h>
#include <gint/atomic.h>

/* internal global witch content Casio and Gint environment */
void *kernel_env_casio;
void *kernel_env_gint;

/* global information ( workaround >_< ) */
void *gint_vbr = NULL;

/* kinit(): Install and start gint */
void kinit(void)
{
	/* generate the VBR address */
	#ifdef FX9860G
	/* VBR is loaded 0x600 bytes before end of the user RAM (0x100 bytes at
	   the start of the VBR space are unused) */
	gint_vbr = (void*)(uintptr_t)mmu_uram() + 0x1a00 - 0x100;
	#endif

	#ifdef FXCG50
	/* VBR is loaded at the start of the user RAM */
	gint_vbr = (void*)(uintptr_t)mmu_uram();
	#endif

	/* create Casio's context, switch to Gint and save Gint context */
	kernel_env_gint = drivers_context_create();
	kernel_env_casio = drivers_context_create();
	drivers_save(kernel_env_casio);
	drivers_init(kernel_env_gint);
	drivers_save(kernel_env_gint);
}

/* kquit(): Quit gint and give back control to the system */
void kquit(void)
{
	drivers_restore(kernel_env_casio);
	atomic_begin();
	drivers_context_destroy(&kernel_env_casio);
	drivers_context_destroy(&kernel_env_gint);
	atomic_end();
}