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Rev 3743 Rev 3770
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}
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}
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/**
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/**
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 * Performs sun4u-specific initialization. The components are expected
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 * Performs sun4u-specific initialization. The components are expected
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 * to be already copied and boot allocator initialized.
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 * to be already copied and boot allocator initialized.
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 *
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 * @param base  kernel base virtual address
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 * @param top   virtual address above which the boot allocator
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 *      can make allocations
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 */
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 */
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static void bootstrap_sun4u(void)
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static void bootstrap_sun4u(void *base, unsigned int top)
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{
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{
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    void *balloc_base;
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    /*
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     * Claim and map the physical memory for the boot allocator.
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     * Initialize the boot allocator.
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     */
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    balloc_base = base + ALIGN_UP(top, PAGE_SIZE);
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    (void) ofw_claim_phys(bootinfo.physmem_start + balloc_base,
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        BALLOC_MAX_SIZE);
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    (void) ofw_map(balloc_base, balloc_base, BALLOC_MAX_SIZE, -1);
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    balloc_init(&bootinfo.ballocs, (uintptr_t)balloc_base);
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    printf("\nCanonizing OpenFirmware device tree...");
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    printf("\nCanonizing OpenFirmware device tree...");
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    bootinfo.ofw_root = ofw_tree_build();
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    bootinfo.ofw_root = ofw_tree_build();
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    printf("done.\n");
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    printf("done.\n");
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    detect_subarchitecture();
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    detect_subarchitecture();
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 * Performs sun4v-specific initialization. The components are expected
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 * Performs sun4v-specific initialization. The components are expected
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 * to be already copied and boot allocator initialized.
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 * to be already copied and boot allocator initialized.
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 */
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 */
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static void bootstrap_sun4v(void)
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static void bootstrap_sun4v(void)
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{
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{
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    /*
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     * When SILO booted, the OBP had established a virtual to physical
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     * memory mapping. This mapping is not an identity (because the
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     * physical memory starts on non-zero address) - this is not
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     * surprising. But! The mapping even does not map virtual address
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     * 0 onto the starting address of the physical memory, but onto an
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     * address which is 0x400000 bytes higher. The reason is that the
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     * OBP had already used the memory just at the beginning of the
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     * physical memory, so that memory cannot be used by SILO (nor
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     * bootloader). As for now, we solve it by a nasty workaround:
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     * we pretend that the physical memory starts 0x400000 bytes further
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     * than it actually does (and hence pretend that the physical memory
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     * is 0x400000 bytes smaller). Of course, the value 0x400000 will most
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     * probably depend on the machine and OBP version (the workaround now
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     * works on Simics). A solution would be to inspect the "available"
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     * property of the "/memory" node to find out which parts of memory
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     * are used by OBP and redesign the algorithm of copying
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     * kernel/init tasks/ramdisk from the bootable image to memory
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     * (which we must do anyway because of issues with claiming the memory
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     * on Serengeti).
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     */
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    bootinfo.physmem_start += 0x400000;
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    bootinfo.memmap.zones[0].start += 0x400000;
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    bootinfo.memmap.zones[0].size -= 0x400000;
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}
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}
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void bootstrap(void)
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void bootstrap(void)
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{
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{
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    void *base = (void *) KERNEL_VIRTUAL_ADDRESS;
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    void *base = (void *) KERNEL_VIRTUAL_ADDRESS;
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    void *balloc_base;
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    unsigned int top = 0;
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    unsigned int top = 0;
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    int i, j;
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    int i, j;
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    detect_architecture();
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    detect_architecture();
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    init_components(components);
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    init_components(components);
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    (void) ofw_claim_phys(bootinfo.physmem_start + base,
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    (void) ofw_claim_phys(bootinfo.physmem_start + base,
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        ALIGN_UP(components[0].size, PAGE_SIZE));
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        ALIGN_UP(components[0].size, PAGE_SIZE));
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    memcpy(base, components[0].start, components[0].size);
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    memcpy(base, components[0].start, components[0].size);
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    printf("done.\n");
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    printf("done.\n");
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    /*
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     * Claim and map the physical memory for the boot allocator.
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     * Initialize the boot allocator.
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     */
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    balloc_base = base + ALIGN_UP(top, PAGE_SIZE);
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    (void) ofw_claim_phys(bootinfo.physmem_start + balloc_base,
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        BALLOC_MAX_SIZE);
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    (void) ofw_map(balloc_base, balloc_base, BALLOC_MAX_SIZE, -1);
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    balloc_init(&bootinfo.ballocs, (uintptr_t)balloc_base);
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    /* perform architecture-specific initialization */
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    /* perform architecture-specific initialization */
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    if (architecture == COMPATIBLE_SUN4U) {
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    if (architecture == COMPATIBLE_SUN4U) {
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        bootstrap_sun4u();
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        bootstrap_sun4u(base, top);
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    } else if (architecture == COMPATIBLE_SUN4V) {
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    } else if (architecture == COMPATIBLE_SUN4V) {
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        bootstrap_sun4v();
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        bootstrap_sun4v();
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    } else {
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    } else {
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        printf("Unknown architecture.\n");
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        printf("Unknown architecture.\n");
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        halt();
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        halt();