From 18b281debf9262677f451d992010661ed10994d6 Mon Sep 17 00:00:00 2001
From: Max Wash <mbswash@gmail.com>
Date: Fri, 6 Mar 2026 20:12:12 +0000
Subject: [PATCH] kernel: bsp: add support for static bootstrap executables

---
 kernel/bsp.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 78 insertions(+), 2 deletions(-)

diff --git a/kernel/bsp.c b/kernel/bsp.c
index ca2adfe..dabb2a5 100644
--- a/kernel/bsp.c
+++ b/kernel/bsp.c
@@ -69,7 +69,7 @@ kern_status_t bsp_load(struct bsp *bsp, const struct boot_module *mod)
 	return KERN_OK;
 }
 
-static kern_status_t map_executable(
+static kern_status_t map_executable_dyn(
 	struct bsp *bsp,
 	struct task *task,
 	virt_addr_t *entry)
@@ -164,6 +164,82 @@ static kern_status_t map_executable(
 	return KERN_OK;
 }
 
+static kern_status_t map_executable_exec(
+	struct bsp *bsp,
+	struct task *task,
+	virt_addr_t *entry)
+{
+	kern_status_t status = KERN_OK;
+	struct vm_object *data = vm_object_create(
+		".data",
+		5,
+		bsp->bsp_trailer.bsp_data_size,
+		VM_PROT_READ | VM_PROT_WRITE | VM_PROT_USER);
+	if (!data) {
+		return KERN_NO_MEMORY;
+	}
+
+	virt_addr_t text_base = 0, data_base = 0;
+
+	off_t text_foffset = bsp->bsp_trailer.bsp_exec_offset
+	                   + bsp->bsp_trailer.bsp_text_faddr;
+	off_t data_foffset = 0;
+	off_t text_voffset = bsp->bsp_trailer.bsp_text_vaddr;
+	off_t data_voffset = bsp->bsp_trailer.bsp_data_vaddr;
+
+	text_voffset -= vm_region_get_base_address(task->t_address_space);
+	data_voffset -= vm_region_get_base_address(task->t_address_space);
+
+#if 0
+	size_t tmp = 0;
+	status = vm_object_copy(
+		data,
+		0,
+		bsp->bsp_vmo,
+		bsp->bsp_trailer.bsp_data_faddr,
+		bsp->bsp_trailer.bsp_data_size,
+		&tmp);
+
+	tracek("read %zuB of data from executable", tmp);
+#endif
+
+	tracek("text_foffset=%06llx, data_foffset=%06llx",
+	       text_foffset,
+	       data_foffset);
+	tracek("text_voffset=%08llx, data_voffset=%08llx",
+	       text_voffset,
+	       data_voffset);
+
+	status = vm_region_map_object(
+		task->t_address_space,
+		text_voffset,
+		bsp->bsp_vmo,
+		text_foffset,
+		bsp->bsp_trailer.bsp_text_size,
+		VM_PROT_READ | VM_PROT_EXEC | VM_PROT_USER,
+		&text_base);
+	if (status != KERN_OK) {
+		return status;
+	}
+
+	status = vm_region_map_object(
+		task->t_address_space,
+		data_voffset,
+		data,
+		data_foffset,
+		bsp->bsp_trailer.bsp_data_size,
+		VM_PROT_READ | VM_PROT_WRITE | VM_PROT_USER,
+		&data_base);
+	if (status != KERN_OK) {
+		return status;
+	}
+
+	tracek("text_base=%08llx, data_base=%08llx", text_base, data_base);
+
+	*entry = bsp->bsp_trailer.bsp_exec_entry;
+	return KERN_OK;
+}
+
 kern_status_t bsp_launch_async(struct bsp *bsp, struct task *task)
 {
 	virt_addr_t stack_buffer, bsp_data_base;
@@ -205,7 +281,7 @@ kern_status_t bsp_launch_async(struct bsp *bsp, struct task *task)
 		return status;
 	}
 
-	status = map_executable(bsp, task, &entry);
+	status = map_executable_exec(bsp, task, &entry);
 	if (status != KERN_OK) {
 		return status;
 	}