112 lines
2.6 KiB
C
112 lines
2.6 KiB
C
//---
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//
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// gint core module: sh7705 interrupt handler
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//
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// Of course all the work related to interrupts is heavily platform-
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// dependent. This module handles interrupts and configures the MPU to
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// save and restore the system's configuration when execution ends.
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//
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//---
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#include <internals/gint.h>
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#include <internals/rtc.h>
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#include <gint.h>
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#include <timer.h>
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#include <7705.h>
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#include <rtc.h>
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/*
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gint_reg()
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Returns the address of a common register. All common registers exist
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on both platforms but they may hold different values for the same
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information (f.i. EXPEVT may not return the same value for a given
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exception on both 7705 and 7305).
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*/
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volatile void *gint_reg_7705(gint_register_t reg)
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{
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switch(reg)
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{
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case register_intevt: return (void *)0xa4000000;
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case register_tra: return (void *)0xffffffd0;
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case register_expevt: return (void *)0xffffffd4;
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case register_mmucr: return (void *)0xfffffff4;
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case register_tea: return (void *)0xfffffffc;
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default: return NULL;
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}
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}
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//---
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// Setup.
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//---
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static unsigned short iprs[8];
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static unsigned char rcr2;
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static void gint_priority_lock_7705(void)
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{
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// Saving the interrupt masks from registers IPRA to IPRH.
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iprs[0] = INTC.IPRA.WORD;
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iprs[1] = INTC.IPRB.WORD;
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iprs[2] = INTX.IPRC.WORD;
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iprs[3] = INTX.IPRD.WORD;
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iprs[4] = INTX.IPRE.WORD;
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iprs[5] = INTX.IPRF.WORD;
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iprs[6] = INTX.IPRG.WORD;
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iprs[7] = INTX.IPRH.WORD;
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// Disabling everything by default to avoid receiving an interrupt that
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// the handler doesn't handle, which would cause the user program to
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// freeze.
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INTC.IPRA.WORD = 0x0000;
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INTC.IPRB.WORD = 0x0000;
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INTX.IPRC.WORD = 0x0000;
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INTX.IPRD.WORD = 0x0000;
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INTX.IPRE.WORD = 0x0000;
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INTX.IPRF.WORD = 0x0000;
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INTX.IPRG.WORD = 0x0000;
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INTX.IPRH.WORD = 0x0000;
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// Allowing RTC, which handles keyboard.
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INTC.IPRA.BIT._RTC = 10;
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INTC.IPRA.BIT._TMU0 = 12;
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INTC.IPRA.BIT._TMU1 = 12;
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INTC.IPRA.BIT._TMU2 = 12;
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}
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static void gint_priority_unlock_7705(void)
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{
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// Restoring the saved states.
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INTC.IPRA.WORD = iprs[0];
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INTC.IPRB.WORD = iprs[1];
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INTX.IPRC.WORD = iprs[2];
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INTX.IPRD.WORD = iprs[3];
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INTX.IPRE.WORD = iprs[4];
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INTX.IPRF.WORD = iprs[5];
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INTX.IPRG.WORD = iprs[6];
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INTX.IPRH.WORD = iprs[7];
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}
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void gint_setup_7705(void)
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{
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volatile struct mod_rtc *RTC = RTC_SH7705;
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gint_priority_lock_7705();
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// Saving the RTC configuration.
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rcr2 = RTC->RCR2.BYTE;
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// Disabling RTC interrupts by default.
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RTC->RCR2.BYTE = 0x09;
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}
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void gint_stop_7705(void)
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{
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volatile struct mod_rtc *RTC = RTC_SH7705;
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gint_priority_unlock_7705();
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// Restoring the RTC configuration.
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RTC->RCR2.BYTE = rcr2;
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}
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