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setup.c

/*
 *    Machine specific setup for generic
 */

#include <linux/init.h>
#include <linux/interrupt.h>
#include <asm/arch_hooks.h>
#include <asm/voyager.h>
#include <asm/e820.h>
#include <asm/io.h>
#include <asm/setup.h>

void __init pre_intr_init_hook(void)
{
      init_ISA_irqs();
}

/*
 * IRQ2 is cascade interrupt to second interrupt controller
 */
static struct irqaction irq2 = {
      .handler = no_action,
      .mask = CPU_MASK_NONE,
      .name = "cascade",
};

void __init intr_init_hook(void)
{
#ifdef CONFIG_SMP
      smp_intr_init();
#endif

      setup_irq(2, &irq2);
}

void __init pre_setup_arch_hook(void)
{
      /* Voyagers run their CPUs from independent clocks, so disable
       * the TSC code because we can't sync them */
      tsc_disable = 1;
}

void __init trap_init_hook(void)
{
}

static struct irqaction irq0  = {
      .handler = timer_interrupt,
      .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_IRQPOLL,
      .mask = CPU_MASK_NONE,
      .name = "timer"
};

void __init time_init_hook(void)
{
      irq0.mask = cpumask_of_cpu(safe_smp_processor_id());
      setup_irq(0, &irq0);
}

/* Hook for machine specific memory setup. */

char * __init machine_specific_memory_setup(void)
{
      char *who;

      who = "NOT VOYAGER";

      if(voyager_level == 5) {
            __u32 addr, length;
            int i;

            who = "Voyager-SUS";

            e820.nr_map = 0;
            for(i=0; voyager_memory_detect(i, &addr, &length); i++) {
                  add_memory_region(addr, length, E820_RAM);
            }
            return who;
      } else if(voyager_level == 4) {
            __u32 tom;
            __u16 catbase = inb(VOYAGER_SSPB_RELOCATION_PORT)<<8;
            /* select the DINO config space */
            outb(VOYAGER_DINO, VOYAGER_CAT_CONFIG_PORT);
            /* Read DINO top of memory register */
            tom = ((inb(catbase + 0x4) & 0xf0) << 16)
                  + ((inb(catbase + 0x5) & 0x7f) << 24);

            if(inb(catbase) != VOYAGER_DINO) {
                  printk(KERN_ERR "Voyager: Failed to get DINO for L4, setting tom to EXT_MEM_K\n");
                  tom = (boot_params.screen_info.ext_mem_k)<<10;
            }
            who = "Voyager-TOM";
            add_memory_region(0, 0x9f000, E820_RAM);
            /* map from 1M to top of memory */
            add_memory_region(1*1024*1024, tom - 1*1024*1024, E820_RAM);
            /* FIXME: Should check the ASICs to see if I need to
             * take out the 8M window.  Just do it at the moment
             * */
            add_memory_region(8*1024*1024, 8*1024*1024, E820_RESERVED);
            return who;
      }

      who = "BIOS-e820";

      /*
       * Try to copy the BIOS-supplied E820-map.
       *
       * Otherwise fake a memory map; one section from 0k->640k,
       * the next section from 1mb->appropriate_mem_k
       */
      sanitize_e820_map(boot_params.e820_map, &boot_params.e820_entries);
      if (copy_e820_map(boot_params.e820_map, boot_params.e820_entries)
          < 0) {
            unsigned long mem_size;

            /* compare results from other methods and take the greater */
            if (boot_params.alt_mem_k
                < boot_params.screen_info.ext_mem_k) {
                  mem_size = boot_params.screen_info.ext_mem_k;
                  who = "BIOS-88";
            } else {
                  mem_size = boot_params.alt_mem_k;
                  who = "BIOS-e801";
            }

            e820.nr_map = 0;
            add_memory_region(0, LOWMEMSIZE(), E820_RAM);
            add_memory_region(HIGH_MEMORY, mem_size << 10, E820_RAM);
      }
      return who;
}

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