From 5ff54a875642962fc857cee00bde17f9a465f1fa Mon Sep 17 00:00:00 2001 From: Bradley Morgan Date: Sun, 4 Oct 2026 10:42:10 +0000 Subject: tashaboot: arm64 bootloader holy shit it's here, Tashaboot, based from arm arm, enjoy reading this masterpiece Signed-off-by: Bradley Morgan --- include/dtb_patch.h | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) create mode 100644 include/dtb_patch.h (limited to 'include/dtb_patch.h') diff --git a/include/dtb_patch.h b/include/dtb_patch.h new file mode 100644 index 0000000..7fbe225 --- /dev/null +++ b/include/dtb_patch.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __TB_DTB_PATCH_H +#define __TB_DTB_PATCH_H + +#include + +/* + * minimal dtb patcher, no libfdt. walks the flattened devicetree + * structure per the devicetree specification (devicetree.dtsi format: + * FDT_BEGIN_NODE, name, property, FDT_END_NODE) and rewrites the cpu + * nodes for spin table bringup. + * + * what it does: + * /cpus/cpu@N: enable-method = "spin-table" + * cpu-release-addr = gate address of core N + * /psci: status = "disabled" (so the kernel falls back to the + * spin table instead of trying hvc) + * + * properties are rewritten in place where the space fits, the + * enable-method string shrinks, cpu-release-addr reuses the space + * of an old value. new properties are appended to the last cpu node + * by growing the struct block and moving the strings block. + */ + +int tb_dtb_patch_spin_table(uintptr_t dtb, uintptr_t *gates, int ngates); + +#endif /* __TB_DTB_PATCH_H */ -- cgit v1.2.3