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-rw-r--r--boot/Makefile11
-rw-r--r--boot/amd64/generic/Makefile29
-rw-r--r--boot/amd64/generic/biosboot/Makefile15
-rw-r--r--boot/amd64/generic/biosboot/biosboot.S54
-rw-r--r--boot/amd64/generic/biosboot/link.ld26
-rw-r--r--boot/amd64/generic/mbr/Makefile15
-rw-r--r--boot/amd64/generic/mbr/link.ld26
-rw-r--r--boot/amd64/generic/mbr/mbr.S213
-rw-r--r--boot/amd64/generic/mk/build.mk19
-rw-r--r--boot/amd64/generic/stage3/Makefile22
-rw-r--r--boot/amd64/generic/stage3/entry.c7
-rw-r--r--boot/amd64/generic/stage3/link.ld26
12 files changed, 463 insertions, 0 deletions
diff --git a/boot/Makefile b/boot/Makefile
new file mode 100644
index 0000000..9f40b8a
--- /dev/null
+++ b/boot/Makefile
@@ -0,0 +1,11 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+.PHONY: all
+all: machine
+
+.PHONY: machine
+machine:
+ cd $(CONFIG_TARGET_ARCH)/$(CONFIG_TARGET_BOARD); $(MAKE)
diff --git a/boot/amd64/generic/Makefile b/boot/amd64/generic/Makefile
new file mode 100644
index 0000000..c911fd7
--- /dev/null
+++ b/boot/amd64/generic/Makefile
@@ -0,0 +1,29 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+.PHONY: all
+all: mbr biosboot stage3 image
+
+.PHONY: image
+image:
+ mkdir -p rdar_root
+ cat biosboot/biosboot.bin stage3/stage3.bin >rdar_root/s2.bin
+ cd rdar_root; rdar -i . -o ../bootar.rdar
+ rm -rf rdar_root
+ cat mbr/mbr.bin bootar.rdar >$(GLOBAL_PROJECT_ROOT)/out/ams.img
+ dd if=/dev/zero of=/tmp/zero-pad.tmp count=8 bs=512
+ cat /tmp/zero-pad.tmp >>$(GLOBAL_PROJECT_ROOT)/out/ams.img
+
+.PHONY: stage3
+stage3:
+ cd stage3; $(MAKE)
+
+.PHONY: biosboot
+biosboot:
+ cd biosboot; $(MAKE)
+
+.PHONY: mbr
+mbr:
+ cd mbr; $(MAKE)
diff --git a/boot/amd64/generic/biosboot/Makefile b/boot/amd64/generic/biosboot/Makefile
new file mode 100644
index 0000000..e9854be
--- /dev/null
+++ b/boot/amd64/generic/biosboot/Makefile
@@ -0,0 +1,15 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+include ../mk/build.mk
+
+CFLAGS = $(INTERNAL_CFLAGS)
+
+.PHONY: all
+all: biosboot
+
+.PHONY: biosboot
+biosboot:
+ $(CC) $(CFLAGS) -Tlink.ld biosboot.S -o biosboot.bin
diff --git a/boot/amd64/generic/biosboot/biosboot.S b/boot/amd64/generic/biosboot/biosboot.S
new file mode 100644
index 0000000..bf2b004
--- /dev/null
+++ b/boot/amd64/generic/biosboot/biosboot.S
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+ .text
+ .code16
+ .globl _start
+_start:
+ cli
+ xor %ax, %ax
+ mov %ax, %ds
+ mov %ax, %es
+ mov %ax, %ss
+
+ lgdt gdtr
+ mov %cr0, %eax
+ or $1, %eax
+ mov %eax, %cr0
+ ljmp $0x08,$1f
+
+ .code32
+1: mov $0x10, %ax
+ mov %ax, %es
+ mov %ax, %ss
+ mov %ax, %fs
+ mov %ax, %gs
+ mov %ax, %ds
+ jmp c_thunk
+
+gdt:
+.null:
+ .quad 0
+.code:
+ .word 0xFFFF
+ .word 0x0000
+ .byte 0x00
+ .byte 0b10011010
+ .byte 0b11001111
+ .byte 0x00
+.data:
+ .word 0xFFFF
+ .word 0x0000
+ .byte 0x00
+ .byte 0b10010010
+ .byte 0b11001111
+ .byte 0x00
+gdtr:
+ .word . - gdt - 1
+ .long gdt
+
+/* Fall-through : everything above this */
+c_thunk:
+ nop
diff --git a/boot/amd64/generic/biosboot/link.ld b/boot/amd64/generic/biosboot/link.ld
new file mode 100644
index 0000000..f039b2b
--- /dev/null
+++ b/boot/amd64/generic/biosboot/link.ld
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+OUTPUT_FORMAT(binary)
+
+SECTIONS {
+ . = 0x7C00;
+
+ .text : {
+ *(.text)
+ }
+
+ .data : {
+ *(.data)
+ }
+
+ .rodata : {
+ *(.rodata)
+ }
+
+ .bss : {
+ *(.bss)
+ }
+}
diff --git a/boot/amd64/generic/mbr/Makefile b/boot/amd64/generic/mbr/Makefile
new file mode 100644
index 0000000..c9ae0dc
--- /dev/null
+++ b/boot/amd64/generic/mbr/Makefile
@@ -0,0 +1,15 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+include ../mk/build.mk
+
+CFLAGS = $(INTERNAL_CFLAGS)
+
+.PHONY: all
+all: mbr
+
+.PHONY: mbr
+mbr:
+ $(CC) $(CFLAGS) -Tlink.ld mbr.S -o mbr.bin
diff --git a/boot/amd64/generic/mbr/link.ld b/boot/amd64/generic/mbr/link.ld
new file mode 100644
index 0000000..fbc3b21
--- /dev/null
+++ b/boot/amd64/generic/mbr/link.ld
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+OUTPUT_FORMAT(binary)
+
+SECTIONS {
+ . = 0x00;
+
+ .text : {
+ *(.text)
+ }
+
+ .data : {
+ *(.data)
+ }
+
+ .rodata : {
+ *(.rodata)
+ }
+
+ .bss : {
+ *(.bss)
+ }
+}
diff --git a/boot/amd64/generic/mbr/mbr.S b/boot/amd64/generic/mbr/mbr.S
new file mode 100644
index 0000000..7cd7484
--- /dev/null
+++ b/boot/amd64/generic/mbr/mbr.S
@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+#define BOOT_SEG 0x7C0 /* Segment we reside on startup */
+#define BOOT_RELOC_SEG 0x7A0 /* Relocation segment */
+#define RDAR_MAGIC ">RDAR!"
+#define RDAR_MAGIC_LEN 6
+#define BOOT_PATH "s2.bin"
+#define BOOT_PATH_LEN 6
+
+ .text
+ .code16
+_start:
+ ljmp $BOOT_SEG,$main
+main:
+ cli
+ cld
+
+ /* Set segment registers */
+ xor %ax, %ax
+ mov %ax, %fs
+ mov %ax, %gs
+ mov %ax, %ss
+ mov %ax, %es
+ mov $BOOT_SEG, %ax
+ mov %ax, %ds
+
+ /* Save the drive */
+ mov %dl, drive_num
+
+ /*
+ * The second stage bootloader expects to be loaded to 0x7C00 but since we are
+ * already executing at this address we'll need to relocate ourselves first before
+ * we clobber it.
+ */
+ mov $BOOT_SEG, %ax
+ mov %ax, %ds
+ mov $BOOT_RELOC_SEG, %ax
+ mov %ax, %es
+ xor %si, %si
+ xor %di, %di
+ mov $0x200, %cx
+ cld
+ rep movsb
+
+ jmp $BOOT_RELOC_SEG,$1f
+1: mov $0x7C00, %sp
+
+ /* Load two sectors */
+ movw $2, dap_blkcnt
+ movl $1, dap_lba_low
+ call disk_read_lba
+
+ mov $BOOT_RELOC_SEG, %ax
+ mov %ax, %ds
+
+ /* Get stage2 */
+ call find_stage2
+
+ /* Obtain the data offset */
+ mov $BOOT_SEG, %ax
+ mov %ax, %ds
+ add $40, %si
+ movw (%si), %si
+
+ mov $BOOT_SEG, %ax
+ mov %ax, %ds
+ mov %ax, %es
+ xor %di, %di
+ mov $0x200, %cx
+ cld
+ rep movsb
+
+ /* Jump to stage 2 */
+ xor %ax, %ax
+ mov %ax, %ds
+ ljmp $0x0000,$0x7C00
+
+/*
+ * Write a character to the boot console
+ *
+ * %al: Character to write
+ */
+putc:
+ mov $0x0E, %ah
+ xor %bh, %bh
+ int $0x10
+ ret
+
+/*
+ * Write a string to the boot console
+ *
+ * %si: Pointer to string to write
+ */
+puts:
+ lodsb
+ or %al, %al
+ jz 1f
+ call putc
+ jmp puts
+1: ret
+
+/*
+ * Locate stage2 on the disk
+ *
+ * Stage 2 data descriptor is returned in %SI
+ */
+find_stage2:
+ push %ds
+ push %es
+
+ /* Verify that magic is correct */
+ mov $BOOT_SEG, %ax
+ mov %ax, %ds
+ xor %bx, %bx /* Tracks %SI */
+ xor %si, %si
+ mov $BOOT_RELOC_SEG, %ax
+ mov %ax, %es
+ mov $rdar_magic, %di
+ mov $RDAR_MAGIC_LEN, %cx
+ rep cmpsb
+ jne .bad_magic
+
+ /* Iterate every data descriptor */
+ clc /* Carry set if found */
+1: movw %ds:6, %cx /* Add data descriptor size */
+ mov %bx, %si
+ mov %si, %dx
+ add %cx, %bx
+ mov $rdar_magic, %di
+ mov $RDAR_MAGIC_LEN, %cx
+ rep cmpsb
+ jne .not_found
+
+ /* Does the path match? */
+ mov %dx, %si
+ add $8, %si
+ mov $stage2_path, %di
+ mov $BOOT_PATH_LEN, %cx
+ rep cmpsb
+ jne 1b
+
+ mov %dx, %si
+ stc
+ pop %es
+ pop %ds
+ jnc .not_found
+ ret
+.not_found:
+ pop %ds
+ mov $not_found_msg, %si
+ call puts
+1: cli
+ hlt
+ jmp 1b
+
+.bad_magic:
+ /* Restore %DS */
+ mov $BOOT_RELOC_SEG, %ax
+ mov %ax, %ds
+
+ mov $bad_magic_msg, %si
+ call puts
+1: cli
+ hlt
+ jmp 1b
+
+/*
+ * Read sectors from the disk
+ */
+disk_read_lba:
+ pusha
+ mov $dap, %si
+ mov $0x42, %ah
+ mov drive_num, %dl
+ int $0x13
+ jc .error
+ popa
+ ret
+.error:
+ mov $disk_err_msg, %si
+ call puts
+1: cli
+ hlt
+ jmp 1b
+
+/* Global stores */
+rdar_magic: .ascii RDAR_MAGIC
+bad_magic_msg: .ascii "bad RDAR magic\r\n\0"
+not_found_msg: .ascii "stage 2 not found\r\n\0"
+disk_err_msg: .ascii "\r\n!!!disk error!!!\r\n\0"
+stage2_path: .ascii BOOT_PATH
+drive_num: .byte 0
+
+dap:
+ .byte 0x10
+ .byte 0x00
+dap_blkcnt:
+ .word 0
+dap_destptr:
+ .word 0x7C00
+dap_destseg:
+ .word 0x0000
+dap_lba_low:
+ .long 0
+dap_lba_high:
+ .long 0
+
+ .org 510
+ .byte 0x55
+ .byte 0xAA
diff --git a/boot/amd64/generic/mk/build.mk b/boot/amd64/generic/mk/build.mk
new file mode 100644
index 0000000..3388d41
--- /dev/null
+++ b/boot/amd64/generic/mk/build.mk
@@ -0,0 +1,19 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+CC = \
+ clang
+
+INTERNAL_CFLAGS = \
+ -Wall \
+ -pedantic \
+ -ffreestanding \
+ -nostdlib \
+ -nostdinc \
+ -mno-red-zone \
+ -mno-sse \
+ -mno-sse2 \
+ -mno-avx \
+ -mno-avx2
diff --git a/boot/amd64/generic/stage3/Makefile b/boot/amd64/generic/stage3/Makefile
new file mode 100644
index 0000000..08e159e
--- /dev/null
+++ b/boot/amd64/generic/stage3/Makefile
@@ -0,0 +1,22 @@
+#
+# Copyright (c) 2026, Apollo Telephone Laboratories.
+# Provided under the BSD-3 clause.
+#
+
+include ../mk/build.mk
+
+CFLAGS = $(INTERNAL_CFLAGS) -MMD
+CFILES = $(shell find . -name "*.c")
+OFILES = $(CFILES:.c=.o)
+DFILES = $(CFILES:.c=.d)
+
+.PHONY: all
+all: stage3
+
+.PHONY: stage3
+stage3: $(OFILES)
+ $(CC) $(CFLAGS) -Tlink.ld $(OFILES) -o stage3.bin
+
+-include $(DFILES)
+%.o: %.c
+ $(CC) -c $< $(CFLAGS) -o $@
diff --git a/boot/amd64/generic/stage3/entry.c b/boot/amd64/generic/stage3/entry.c
new file mode 100644
index 0000000..3e4b95b
--- /dev/null
+++ b/boot/amd64/generic/stage3/entry.c
@@ -0,0 +1,7 @@
+void
+main(void)
+{
+ for (;;) {
+ __asm__ __volatile__("cli; hlt");
+ }
+}
diff --git a/boot/amd64/generic/stage3/link.ld b/boot/amd64/generic/stage3/link.ld
new file mode 100644
index 0000000..abbd785
--- /dev/null
+++ b/boot/amd64/generic/stage3/link.ld
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2026, Apollo Telephone Laboratories.
+ * Provided under the BSD-3 clause.
+ */
+
+OUTPUT_FORMAT(binary)
+
+SECTIONS {
+ . = 0x0000;
+
+ .text : {
+ *(.text)
+ }
+
+ .data : {
+ *(.data)
+ }
+
+ .rodata : {
+ *(.rodata)
+ }
+
+ .bss : {
+ *(.bss)
+ }
+}
generated by cgit v1.2.3 (git 2.51.0) at 2026-10-20 11:10:24 +0000