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source:
rtems/c/src/lib/libbsp/bfin/bf537Stamp/start/start.S
@
ef26454
| Last change on this file since ef26454 was ef26454, checked in by Sebastian Huber <sebastian.huber@…>, on 04/29/14 at 06:43:04 | |
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| File size: 1.8 KB | |
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| [61f8fb0e] | 1 | #include <libcpu/bf537.h> |
| 2 | #include <libcpu/sicRegs.h> | |
| 3 | #include <libcpu/cecRegs.h> | |
| [543f17b3] | 4 | #include <libcpu/dmaRegs.h> |
| [61f8fb0e] | 5 | #include <libcpu/coreTimerRegs.h> |
| 6 | ||
| 7 | #ifndef LO | |
| 8 | #define LO(con32) ((con32) & 0xFFFF) | |
| 9 | #endif | |
| 10 | #ifndef HI | |
| 11 | #define HI(con32) (((con32) >> 16) & 0xFFFF) | |
| 12 | #endif | |
| 13 | ||
| 14 | .section .start | |
| 15 | .align 4 | |
| 16 | ||
| 17 | .global __start | |
| 18 | __start: | |
| 19 | cli r0; | |
| 20 | ||
| 21 | /* setup an initial stack */ | |
| 22 | sp.h = 0xFFB0; | |
| 23 | sp.l = 0x0F00; | |
| 24 | ||
| 25 | /* disable timer interrupts */ | |
| 26 | p0.h = HI(TCNTL); | |
| 27 | p0.l = LO(TCNTL); | |
| 28 | r0 = 0; | |
| 29 | [p0] = r0; | |
| 30 | ||
| 31 | /* disable all interrupts routed through sic */ | |
| 32 | p0.h = HI(SIC_IMASK); | |
| 33 | p0.l = LO(SIC_IMASK); | |
| 34 | [p0] = r0; | |
| 35 | ||
| [a319ab04] | 36 | /* clear any pending interrupts */ |
| 37 | p0.h = HI(CEC_ILAT); | |
| 38 | p0.l = LO(CEC_ILAT); | |
| 39 | r0 = 0xffff (z); | |
| 40 | [p0] = r0; | |
| 41 | ||
| [543f17b3] | 42 | /* disable all dma channels */ |
| 43 | p0.h = HI(DMA0_BASE_ADDRESS + DMA_CONFIG_OFFSET); | |
| 44 | p0.l = LO(DMA0_BASE_ADDRESS + DMA_CONFIG_OFFSET); | |
| 45 | p1 = DMA_PITCH; | |
| 46 | p2 = DMA_CHANNELS; | |
| 47 | r0 = ~DMA_CONFIG_DMAEN; | |
| 48 | lsetup(loop1,loop2) lc0 = p2; | |
| 49 | loop1: r1 = w[p0]; | |
| 50 | r1 = r0 & r1; | |
| 51 | loop2: w[p0 ++ p1] = r1.l; | |
| 52 | ||
| [61f8fb0e] | 53 | /* this is so we can stay in supervisor mode and still be able to |
| 54 | accept interrupts later. */ | |
| 55 | p0.h = start; | |
| 56 | p0.l = start; | |
| 57 | p1.h = HI(CEC_EVT15); | |
| 58 | p1.l = LO(CEC_EVT15); | |
| [3495c57] | 59 | |
| [61f8fb0e] | 60 | [p1] = p0; |
| 61 | ||
| 62 | r0 = 0x8000 (z); | |
| 63 | sti r0; | |
| 64 | ||
| 65 | raise 15; | |
| [3495c57] | 66 | |
| [61f8fb0e] | 67 | p0.h = wait; |
| 68 | p0.l = wait; | |
| 69 | ||
| 70 | reti = p0; | |
| 71 | rti; | |
| [3495c57] | 72 | |
| [61f8fb0e] | 73 | /* wait for event 15 */ |
| 74 | wait: | |
| 75 | jump wait; | |
| [3495c57] | 76 | |
| [61f8fb0e] | 77 | start: |
| 78 | [--sp] = reti; /* allow us to process interrupts later */ | |
| 79 | ||
| 80 | /* mask interrupts for now */ | |
| 81 | cli r0; | |
| [3495c57] | 82 | |
| [61f8fb0e] | 83 | p0.h = _bss_start; |
| 84 | p0.l = _bss_start; | |
| 85 | p1.h = _end; | |
| 86 | p1.l = _end; | |
| 87 | r0 = p0; | |
| 88 | r1 = p1; | |
| 89 | r1 = r1 - r0; | |
| [3495c57] | 90 | p1 = r1; |
| [61f8fb0e] | 91 | r0 = 0; |
| 92 | ||
| 93 | /* Set _bss_start until _end to zero */ | |
| [543f17b3] | 94 | lsetup(loop3,loop4) lc0 = p1; |
| 95 | loop3: b[p0] = r0; | |
| 96 | loop4: p0 +=1; | |
| [61f8fb0e] | 97 | |
| [a319ab04] | 98 | l0 = 0; |
| 99 | l1 = 0; | |
| 100 | l2 = 0; | |
| 101 | l3 = 0; | |
| 102 | sp += -12; | |
| 103 | /* r0 == const char *cmdline (currently null) */ | |
| [61f8fb0e] | 104 | p0.h = _boot_card; |
| 105 | p0.l = _boot_card; | |
| 106 | call (p0); | |
| [a319ab04] | 107 | sp += 12; |
| [61f8fb0e] | 108 | |
| [edd19da3] | 109 | HLT |
| [61f8fb0e] | 110 | p0.h = _exit; |
| 111 | p0.l = _exit; | |
| 112 | jump (p0); | |
| 113 |
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