source: mainline/boot/arch/sparc64/src/main.c@ 7e752b2

/*
 * Copyright (c) 2005 Martin Decky
 * Copyright (c) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch/main.h>
#include <arch/arch.h>
#include <arch/asm.h>
#include <arch/ofw.h>
#include <arch/_components.h>
#include <genarch/ofw.h>
#include <genarch/ofw_tree.h>
#include <halt.h>
#include <printf.h>
#include <memstr.h>
#include <version.h>
#include <macros.h>
#include <align.h>
#include <str.h>
#include <errno.h>
#include <inflate.h>

/* The lowest ID (read from the VER register) of some US3 CPU model */
#define FIRST_US3_CPU  0x14

/* The greatest ID (read from the VER register) of some US3 CPU model */
#define LAST_US3_CPU  0x19

/* UltraSPARC IIIi processor implementation code */
#define US_IIIi_CODE  0x15

#define OBP_BIAS  0x400000

#define BALLOC_MAX_SIZE  131072

#define TOP2ADDR(top)  (((void *) KERNEL_ADDRESS) + (top))

/** UltraSPARC architecture */
static uint8_t arch;

/** UltraSPARC subarchitecture */
static uint8_t subarch;

/** Mask of the MID field inside the ICBUS_CONFIG register
 *
 * Shifted by MID_SHIFT bits to the right
 *
 */
static uint16_t mid_mask;

static bootinfo_t bootinfo;

/** Detect the UltraSPARC architecture
 *
 * Detection is done by inspecting the property called "compatible"
 * in the OBP root node. Currently sun4u and sun4v are supported.
 * Set global variable "arch" to the correct value.
 *
 */
static void arch_detect(void)
{
        phandle root = ofw_find_device("/");
        char compatible[OFW_TREE_PROPERTY_MAX_VALUELEN];
        
        if (ofw_get_property(root, "compatible", compatible,
            OFW_TREE_PROPERTY_MAX_VALUELEN) <= 0) {
                printf("Warning: Unable to determine architecture, assuming sun4u.\n");
                arch = ARCH_SUN4U;
                return;
        }
        
        if (str_cmp(compatible, "sun4v") != 0) {
                /*
                 * As not all sun4u machines have "sun4u" in their "compatible"
                 * OBP property (e.g. Serengeti's OBP "compatible" property is
                 * "SUNW,Serengeti"), we will by default fallback to sun4u if
                 * an unknown value of the "compatible" property is encountered.
                 */
                if (str_cmp(compatible, "sun4u") != 0)
                        printf("Warning: Unknown architecture, assuming sun4u.\n");
                arch = ARCH_SUN4U;
        } else
                arch = ARCH_SUN4V;
}


/** Detect the subarchitecture (US, US3) of sun4u
 *
 * Set the global variables "subarch" and "mid_mask" to
 * correct values.
 *
 */
static void sun4u_subarch_detect(void)
{
        uint64_t ver;
        asm volatile (
                "rdpr %%ver, %[ver]\n"
                : [ver] "=r" (ver)
        );
        
        ver = (ver << 16) >> 48;
        
        if ((ver >= FIRST_US3_CPU) && (ver <= LAST_US3_CPU)) {
                subarch = SUBARCH_US3;
                
                if (ver == US_IIIi_CODE)
                        mid_mask = (1 << 5) - 1;
                else
                        mid_mask = (1 << 10) - 1;
                
        } else if (ver < FIRST_US3_CPU) {
                subarch = SUBARCH_US;
                mid_mask = (1 << 5) - 1;
        } else {
                printf("Warning: This CPU is not supported.");
                subarch = SUBARCH_UNKNOWN;
        }
}

/** Perform sun4u-specific SMP initialization.
 *
 */
static void sun4u_smp(void)
{
#ifdef CONFIG_AP
        printf("Checking for secondary processors ...\n");
        ofw_cpu(mid_mask, bootinfo.physmem_start);
#endif
}

/** Perform sun4v-specific fixups.
 *
 */
static void sun4v_fixups(void)
{
        /*
         * When SILO booted, the OBP had established a virtual to physical
         * memory mapping. This mapping is not an identity since the
         * physical memory starts at non-zero address.
         *
         * However, the mapping even does not map virtual address 0
         * onto the starting address of the physical memory, but onto an
         * address which is 0x400000 (OBP_BIAS) bytes higher.
         *
         * The reason is that the OBP had already used the memory just
         * at the beginning of the physical memory. Thus that memory cannot
         * be used by SILO (nor the bootloader).
         *
         * So far, we solve it by a nasty workaround:
         *
         * We pretend that the physical memory starts 0x400000 (OBP_BIAS)
         * bytes further than it actually does (and hence pretend that the
         * physical memory is 0x400000 bytes smaller). Of course, the value
         * 0x400000 will most probably depend on the machine and OBP version
         * (the workaround works on Simics).
         *
         * A proper solution would be to inspect the "available" property
         * of the "/memory" node to find out which parts of memory
         * are used by OBP and redesign the algorithm of copying
         * kernel/init tasks/ramdisk from the bootable image to memory
         * (which we must do anyway because of issues with claiming the memory
         * on Serengeti).
         *
         */
        bootinfo.physmem_start += OBP_BIAS;
        bootinfo.memmap.zones[0].start += OBP_BIAS;
        bootinfo.memmap.zones[0].size -= OBP_BIAS;
}

void bootstrap(void)
{
        version_print();
        
        arch_detect();
        if (arch == ARCH_SUN4U)
                sun4u_subarch_detect();
        else
                subarch = SUBARCH_UNKNOWN;
        
        bootinfo.physmem_start = ofw_get_physmem_start();
        ofw_memmap(&bootinfo.memmap);
        
        void *bootinfo_pa = ofw_translate(&bootinfo);
        void *kernel_address_pa = ofw_translate((void *) KERNEL_ADDRESS);
        void *loader_address_pa = ofw_translate((void *) LOADER_ADDRESS);
        
        printf("\nMemory statistics (total %" PRIu64 " MB, starting at %p)\n",
            bootinfo.memmap.total >> 20, (void *) bootinfo.physmem_start);
        printf(" %p|%p: boot info structure\n", &bootinfo, (void *) bootinfo_pa);
        printf(" %p|%p: kernel entry point\n",
            (void *) KERNEL_ADDRESS, (void *) kernel_address_pa);
        printf(" %p|%p: loader entry point\n",
            (void *) LOADER_ADDRESS, (void *) loader_address_pa);
        
        size_t i;
        for (i = 0; i < COMPONENTS; i++)
                printf(" %p|%p: %s image (%zu/%zu bytes)\n", components[i].start,
                    ofw_translate(components[i].start), components[i].name,
                    components[i].inflated, components[i].size);
        
        void *dest[COMPONENTS];
        size_t top = KERNEL_ADDRESS;
        size_t cnt = 0;
        bootinfo.taskmap.cnt = 0;
        for (i = 0; i < min(COMPONENTS, TASKMAP_MAX_RECORDS); i++) {
                top = ALIGN_UP(top, PAGE_SIZE);
                
                if (i > 0) {
                        bootinfo.taskmap.tasks[bootinfo.taskmap.cnt].addr =
                            (void *) top;
                        bootinfo.taskmap.tasks[bootinfo.taskmap.cnt].size =
                            components[i].inflated;
                        
                        str_cpy(bootinfo.taskmap.tasks[bootinfo.taskmap.cnt].name,
                            BOOTINFO_TASK_NAME_BUFLEN, components[i].name);
                        
                        bootinfo.taskmap.cnt++;
                }
                
                dest[i] = (void *) top;
                top += components[i].inflated;
                cnt++;
        }
        
        printf("\nInflating components ... ");
        
        for (i = cnt; i > 0; i--) {
                printf("%s ", components[i - 1].name);
                
                /*
                 * At this point, we claim the physical memory that we are
                 * going to use. We should be safe in case of the virtual
                 * address space because the OpenFirmware, according to its
                 * SPARC binding, should restrict its use of virtual memory
                 * to addresses from [0xffd00000; 0xffefffff] and
                 * [0xfe000000; 0xfeffffff].
                 *
                 * We don't map this piece of memory. We simply rely on
                 * SILO to have it done for us already in this case.
                 *
                 * XXX SILO only maps 8 MB for us here. We should improve
                 *     this code to be totally independent on the behavior
                 *     of SILO.
                 *
                 */
                ofw_claim_phys(bootinfo.physmem_start + dest[i - 1],
                    ALIGN_UP(components[i - 1].inflated, PAGE_SIZE));
                
                int err = inflate(components[i - 1].start, components[i - 1].size,
                    dest[i - 1], components[i - 1].inflated);
                
                if (err != EOK) {
                        printf("\n%s: Inflating error %d, halting.\n",
                            components[i - 1].name, err);
                        halt();
                }
        }
        
        printf(".\n");
        
        /*
         * Claim and map the physical memory for the boot allocator.
         * Initialize the boot allocator.
         */
        printf("Setting up boot allocator ...\n");
        void *balloc_base = (void *) ALIGN_UP(top, PAGE_SIZE);
        ofw_claim_phys(bootinfo.physmem_start + balloc_base, BALLOC_MAX_SIZE);
        ofw_map(bootinfo.physmem_start + balloc_base, balloc_base,
            BALLOC_MAX_SIZE, -1);
        balloc_init(&bootinfo.ballocs, balloc_base, (uintptr_t) balloc_base,
            BALLOC_MAX_SIZE);
        
        printf("Setting up screens ...\n");
        ofw_setup_screens();
        
        printf("Canonizing OpenFirmware device tree ...\n");
        bootinfo.ofw_root = ofw_tree_build();
        
        if (arch == ARCH_SUN4U)
                sun4u_smp();
        
        if (arch == ARCH_SUN4V)
                sun4v_fixups();
        
        printf("Booting the kernel ...\n");
        jump_to_kernel(bootinfo.physmem_start | BSP_PROCESSOR, &bootinfo, subarch,
            (void *) KERNEL_ADDRESS);
}