URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [orpsocv2/] [sw/] [drivers/] [or1200/] [crt0.S] - Diff between revs 485 and 488

Rev 485	Rev 488
Line 91...	Line 91...

`/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */`	`/* ---[ 0x400: Insn Page Fault exception ]------------------------------- */`
`.org 0x400`	`.org 0x400`
`EXCEPTION_HANDLER`	`EXCEPTION_HANDLER`


`/* ---[ 0x500: Timer exception ]----------------------------------------- */`	`/* ---[ 0x500: Timer exception ]----------------------------------------- */`
`.org 0x500`	`.org 0x500`
`#define TIMER_RELOAD_VALUE (SPR_TTMR_IE \| SPR_TTMR_RT \| ((IN_CLK/TICKS_PER_SEC) & SPR_TTMR_PERIOD))`	`EXCEPTION_HANDLER`
`//EXCEPTION_HANDLER`
`/* Simply load timer_ticks variable and increment */`
`.extern timer_ticks`
`l.addi r1, r1, -136`
`l.sw 0(r1), r25`
`l.sw 4(r1), r26`
`l.movhi r25, hi(timer_ticks)`
`l.ori r25, r25, lo(timer_ticks)`
`l.lwz r26, 0(r25) /* Load variable addr.*/`
`l.addi r26, r26, 1 /* Increment variable */`
`l.sw 0(r25), r26 /* Store variable */`
`l.movhi r25, hi(TIMER_RELOAD_VALUE) /* Load timer value */`
`l.ori r25, r25, lo(TIMER_RELOAD_VALUE)`
`l.mtspr r0, r25, SPR_TTMR /* Reset timer */`
`l.lwz r25, 0(r1)`
`l.lwz r26, 4(r1)`
`l.addi r1, r1, 136`
`l.rfe`

`/* ---[ 0x600: Aligment exception ]-------------------------------------- */`	`/* ---[ 0x600: Aligment exception ]-------------------------------------- */`
`.org 0x600`	`.org 0x600`
`EXCEPTION_HANDLER`	`EXCEPTION_HANDLER`