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https://github.com/brain-hackers/u-boot-brain
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90ae281437
Add a wait option to smp_call_function() to wait for the secondary harts to acknowledge the call-function request. The request is considered to be acknowledged once each secondary hart has cleared the corresponding IPI. As part of the call-function request, the secondary harts invalidate the instruction cache after clearing the IPI. This adds a delay between acknowledgment (clear IPI) and fulfillment (call function) of the request. We want to use the acknowledgment to be able to judge when the request has been completed. Remove the delay by clearing the IPI after cache invalidation and just before calling the function from the request. Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de> Reviewed-by: Rick Chen <rick@andestech.com> Tested-by: Rick Chen <rick@andestech.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2011 Andes Technology Corporation
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* Shawn Lin, Andes Technology Corporation <nobuhiro@andestech.com>
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* Macpaul Lin, Andes Technology Corporation <macpaul@andestech.com>
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* Rick Chen, Andes Technology Corporation <rick@andestech.com>
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*/
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#include <common.h>
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#include <command.h>
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#include <dm.h>
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#include <dm/root.h>
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#include <image.h>
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#include <asm/byteorder.h>
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#include <asm/csr.h>
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#include <asm/smp.h>
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#include <dm/device.h>
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#include <dm/root.h>
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#include <u-boot/zlib.h>
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DECLARE_GLOBAL_DATA_PTR;
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__weak void board_quiesce_devices(void)
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{
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}
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int arch_fixup_fdt(void *blob)
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{
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return 0;
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}
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/**
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* announce_and_cleanup() - Print message and prepare for kernel boot
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*
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* @fake: non-zero to do everything except actually boot
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*/
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static void announce_and_cleanup(int fake)
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{
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printf("\nStarting kernel ...%s\n\n", fake ?
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"(fake run for tracing)" : "");
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bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
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#ifdef CONFIG_BOOTSTAGE_FDT
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bootstage_fdt_add_report();
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#endif
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#ifdef CONFIG_BOOTSTAGE_REPORT
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bootstage_report();
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#endif
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#ifdef CONFIG_USB_DEVICE
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udc_disconnect();
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#endif
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board_quiesce_devices();
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/*
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* Call remove function of all devices with a removal flag set.
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* This may be useful for last-stage operations, like cancelling
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* of DMA operation or releasing device internal buffers.
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*/
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dm_remove_devices_flags(DM_REMOVE_ACTIVE_ALL);
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cleanup_before_linux();
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}
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static void boot_prep_linux(bootm_headers_t *images)
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{
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if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
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#ifdef CONFIG_OF_LIBFDT
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debug("using: FDT\n");
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if (image_setup_linux(images)) {
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printf("FDT creation failed! hanging...");
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hang();
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}
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#endif
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} else {
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printf("Device tree not found or missing FDT support\n");
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hang();
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}
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}
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static void boot_jump_linux(bootm_headers_t *images, int flag)
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{
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void (*kernel)(ulong hart, void *dtb);
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int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
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#ifdef CONFIG_SMP
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int ret;
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#endif
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kernel = (void (*)(ulong, void *))images->ep;
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bootstage_mark(BOOTSTAGE_ID_RUN_OS);
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debug("## Transferring control to kernel (at address %08lx) ...\n",
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(ulong)kernel);
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announce_and_cleanup(fake);
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if (!fake) {
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if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len) {
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#ifdef CONFIG_SMP
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ret = smp_call_function(images->ep,
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(ulong)images->ft_addr, 0, 0);
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if (ret)
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hang();
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#endif
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kernel(gd->arch.boot_hart, images->ft_addr);
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}
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}
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}
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int do_bootm_linux(int flag, int argc, char * const argv[],
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bootm_headers_t *images)
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{
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/* No need for those on RISC-V */
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if (flag & BOOTM_STATE_OS_BD_T || flag & BOOTM_STATE_OS_CMDLINE)
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return -1;
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if (flag & BOOTM_STATE_OS_PREP) {
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boot_prep_linux(images);
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return 0;
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}
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if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
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boot_jump_linux(images, flag);
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return 0;
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}
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boot_prep_linux(images);
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boot_jump_linux(images, flag);
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return 0;
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}
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int do_bootm_vxworks(int flag, int argc, char * const argv[],
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bootm_headers_t *images)
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{
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return do_bootm_linux(flag, argc, argv, images);
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}
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