111 lines
1.6 KiB
C
111 lines
1.6 KiB
C
//---
|
|
//
|
|
// gint core module: interrupt handler
|
|
//
|
|
// Central point of the library. Controls the interrupt handler and
|
|
// defines a few functions to configure callbacks for some interrupts.
|
|
//
|
|
//---
|
|
|
|
#include <gint.h>
|
|
#include <mpu.h>
|
|
#include <stddef.h>
|
|
|
|
static unsigned int
|
|
new_vbr,
|
|
sys_vbr;
|
|
|
|
|
|
|
|
//---
|
|
// Local functions.
|
|
//---
|
|
|
|
/*
|
|
gint_setup()
|
|
Configures interrupt priorities and some parameters to allow gint to
|
|
take control of the interrupt flow.
|
|
*/
|
|
static void gint_setup(void)
|
|
{
|
|
if(isSH3())
|
|
gint_setup_7705();
|
|
else
|
|
gint_setup_7305();
|
|
}
|
|
|
|
/*
|
|
gint_stop()
|
|
Un-configures the interrupt flow to give back the interrupt control to
|
|
the system.
|
|
*/
|
|
static void gint_stop(void)
|
|
{
|
|
if(isSH3())
|
|
gint_stop_7705();
|
|
else
|
|
gint_stop_7305();
|
|
}
|
|
|
|
|
|
|
|
//---
|
|
// Public API.
|
|
//---
|
|
|
|
/*
|
|
gint_systemVBR()
|
|
Returns the vbr address used by the system (saved when execution
|
|
starts).
|
|
*/
|
|
inline unsigned int gint_systemVBR(void)
|
|
{
|
|
return sys_vbr;
|
|
}
|
|
|
|
/*
|
|
gint()
|
|
Handles interrupts.
|
|
*/
|
|
void gint(void)
|
|
{
|
|
if(isSH3())
|
|
gint_7705();
|
|
else
|
|
gint_7305();
|
|
}
|
|
|
|
/*
|
|
gint_init()
|
|
Initializes gint. Loads the interrupt handler into the memory and sets
|
|
the new vbr address.
|
|
*/
|
|
void gint_init(void)
|
|
{
|
|
// Linker script symbols -- gint.
|
|
extern unsigned int
|
|
gint_vbr,
|
|
gint_data,
|
|
bgint, egint;
|
|
|
|
unsigned int *ptr = &bgint;
|
|
unsigned int *src = &gint_data;
|
|
|
|
// Loading the interrupt handler into the memory.
|
|
while(ptr < &egint) *ptr++ = *src++;
|
|
|
|
sys_vbr = gint_getVBR();
|
|
new_vbr = (unsigned int)&gint_vbr;
|
|
|
|
gint_setVBR(new_vbr, gint_setup);
|
|
}
|
|
|
|
/*
|
|
gint_quit()
|
|
Stops gint. Restores the system's configuration and vbr address.
|
|
*/
|
|
void gint_quit(void)
|
|
{
|
|
gint_setVBR(sys_vbr, gint_stop);
|
|
}
|