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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [lib/] [libbsp/] [m68k/] [gen68360/] [startup/] [alloc360.c] - Rev 593
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/* * MC68360 buffer descriptor allocation routines * * W. Eric Norum * Saskatchewan Accelerator Laboratory * University of Saskatchewan * Saskatoon, Saskatchewan, CANADA * eric@skatter.usask.ca * * $Id: alloc360.c,v 1.2 2001-09-27 12:00:08 chris Exp $ */ #include <rtems.h> #include <bsp.h> #include <m68360.h> #include <rtems/error.h> /* * Allocation order: * - Dual-Port RAM section 1 * - Dual-Port RAM section 3 * - Dual-Port RAM section 0 * - Dual-Port RAM section 2 */ static struct { char *base; unsigned int size; unsigned int used; } bdregions[] = { { (char *)&m360.dpram1[0], sizeof m360.dpram1, 0 }, { (char *)&m360.dpram3[0], sizeof m360.dpram3, 0 }, { (char *)&m360.dpram0[0], sizeof m360.dpram0, 0 }, { (char *)&m360.dpram2[0], sizeof m360.dpram2, 0 }, }; /* * Send a command to the CPM RISC processer */ void * M360AllocateBufferDescriptors (int count) { unsigned int i; ISR_Level level; void *bdp = NULL; unsigned int want = count * sizeof(m360BufferDescriptor_t); /* * Running with interrupts disabled is usually considered bad * form, but this routine is probably being run as part of an * initialization sequence so the effect shouldn't be too severe. */ _ISR_Disable (level); for (i = 0 ; i < sizeof(bdregions) / sizeof(bdregions[0]) ; i++) { /* * Verify that the region exists. * This test is necessary since some chips have * less dual-port RAM. */ if (bdregions[i].used == 0) { volatile unsigned char *cp = bdregions[i].base; *cp = 0xAA; if (*cp != 0xAA) { bdregions[i].used = bdregions[i].size; continue; } *cp = 0x55; if (*cp != 0x55) { bdregions[i].used = bdregions[i].size; continue; } *cp = 0x0; } if (bdregions[i].size - bdregions[i].used >= want) { bdp = bdregions[i].base + bdregions[i].used; bdregions[i].used += want; break; } } _ISR_Enable (level); if (bdp == NULL) rtems_panic ("Can't allocate %d buffer descriptor(s).\n", count); return bdp; } void * M360AllocateRiscTimers (int count) { /* * Convert the count to the number of buffer descriptors * of equal or larger size. This ensures that all buffer * descriptors are allocated with appropriate alignment. */ return M360AllocateBufferDescriptors (((count * 4) + sizeof(m360BufferDescriptor_t) - 1) / sizeof(m360BufferDescriptor_t)); }
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