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dc63a086da
This is useful on !virt platforms for kexec, so change things from
BI_VIRT_RNG_SEED to be BI_RNG_SEED, and simply remove BI_VIRT_RNG_SEED
because it only ever lasted one release, and nothing is broken by not
having it. At the same time, keep a comment noting that it's been
removed, so that ID isn't reused. In addition, we previously documented
2-byte alignment, but 4-byte alignment is actually necessary, so update
that comment.
Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: a1ee38ab1a ("m68k: virt: Use RNG seed from bootinfo block")
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Link: https://lore.kernel.org/r/20220927130835.1629806-2-Jason@zx2c4.com
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/reboot.h>
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#include <linux/serial_core.h>
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#include <clocksource/timer-goldfish.h>
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#include <asm/bootinfo.h>
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#include <asm/bootinfo-virt.h>
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#include <asm/byteorder.h>
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#include <asm/machdep.h>
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#include <asm/virt.h>
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#include <asm/config.h>
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struct virt_booter_data virt_bi_data;
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#define VIRT_CTRL_REG_FEATURES 0x00
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#define VIRT_CTRL_REG_CMD 0x04
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static struct resource ctrlres;
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enum {
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CMD_NOOP,
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CMD_RESET,
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CMD_HALT,
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CMD_PANIC,
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};
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static void virt_get_model(char *str)
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{
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/* str is 80 characters long */
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sprintf(str, "QEMU Virtual M68K Machine (%u.%u.%u)",
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(u8)(virt_bi_data.qemu_version >> 24),
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(u8)(virt_bi_data.qemu_version >> 16),
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(u8)(virt_bi_data.qemu_version >> 8));
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}
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static void virt_halt(void)
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{
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void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
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iowrite32be(CMD_HALT, base + VIRT_CTRL_REG_CMD);
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local_irq_disable();
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while (1)
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;
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}
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static void virt_reset(void)
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{
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void __iomem *base = (void __iomem *)virt_bi_data.ctrl.mmio;
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iowrite32be(CMD_RESET, base + VIRT_CTRL_REG_CMD);
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local_irq_disable();
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while (1)
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;
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}
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/*
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* Parse a virtual-m68k-specific record in the bootinfo
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*/
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int __init virt_parse_bootinfo(const struct bi_record *record)
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{
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int unknown = 0;
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const void *data = record->data;
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switch (be16_to_cpu(record->tag)) {
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case BI_VIRT_QEMU_VERSION:
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virt_bi_data.qemu_version = be32_to_cpup(data);
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break;
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case BI_VIRT_GF_PIC_BASE:
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virt_bi_data.pic.mmio = be32_to_cpup(data);
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data += 4;
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virt_bi_data.pic.irq = be32_to_cpup(data);
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break;
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case BI_VIRT_GF_RTC_BASE:
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virt_bi_data.rtc.mmio = be32_to_cpup(data);
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data += 4;
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virt_bi_data.rtc.irq = be32_to_cpup(data);
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break;
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case BI_VIRT_GF_TTY_BASE:
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virt_bi_data.tty.mmio = be32_to_cpup(data);
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data += 4;
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virt_bi_data.tty.irq = be32_to_cpup(data);
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break;
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case BI_VIRT_CTRL_BASE:
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virt_bi_data.ctrl.mmio = be32_to_cpup(data);
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data += 4;
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virt_bi_data.ctrl.irq = be32_to_cpup(data);
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break;
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case BI_VIRT_VIRTIO_BASE:
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virt_bi_data.virtio.mmio = be32_to_cpup(data);
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data += 4;
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virt_bi_data.virtio.irq = be32_to_cpup(data);
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break;
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default:
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unknown = 1;
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break;
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}
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return unknown;
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}
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static void __init virt_sched_init(void)
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{
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goldfish_timer_init(virt_bi_data.rtc.irq,
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(void __iomem *)virt_bi_data.rtc.mmio);
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}
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void __init config_virt(void)
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{
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char earlycon[24];
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snprintf(earlycon, sizeof(earlycon), "early_gf_tty,0x%08x",
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virt_bi_data.tty.mmio);
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setup_earlycon(earlycon);
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ctrlres = (struct resource)
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DEFINE_RES_MEM_NAMED(virt_bi_data.ctrl.mmio, 0x100,
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"virtctrl");
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if (request_resource(&iomem_resource, &ctrlres)) {
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pr_err("Cannot allocate virt controller resource\n");
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return;
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}
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mach_init_IRQ = virt_init_IRQ;
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mach_sched_init = virt_sched_init;
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mach_get_model = virt_get_model;
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mach_reset = virt_reset;
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mach_halt = virt_halt;
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register_platform_power_off(virt_halt);
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}
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