1 files changed, 87 insertions, 0 deletions
diff --git a/src/sys/include/sys/bootvars.h b/src/sys/include/sys/bootvars.h
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+++ b/src/sys/include/sys/bootvars.h
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+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SYS_BOOTVARS_H_
+#define _SYS_BOOTVARS_H_  1
+
+#include <sys/types.h>
+#include <sys/param.h>
+
+#define BOOTVARS_MAGIC 0xDECAFE
+
+/* Flags for bootvars_read() */
+#define BV_BYPASS_CACHE BIT(0)   /* Don't read cached entries */
+
+/*
+ * Framebuffer information
+ *
+ * @io: MMIO address for pixel plotting
+ * @width: Framebuffer width
+ * @height: Framebuffer height
+ * @pitch: Framebuffer pitch
+ * @bpp: Bytes per pixel
+ */
+struct bootvar_fb {
+    uint32_t *io;
+    uint32_t width;
+    uint32_t height;
+    uint32_t pitch;
+    uint32_t bpp;
+};
+
+/*
+ * Various callbacks that are related in one
+ * way or another to the features of the bootloader.
+ */
+struct bootvar_io {
+    char *(*get_module)(const char *path, uint64_t *size);
+};
+
+/*
+ * Boot variables given to us by the bootloader
+ *
+ * @magic: Magic number (see BOOTVARS_MAGIC)
+ * @fbvars: Framebuffer information
+ * @iovars: I/O callbacks
+ * @rsdp: ACPI Root System Descriptor Pointer [vaddr]
+ */
+struct bootvars {
+    uint32_t magic;
+    struct bootvar_fb fbvars;
+    struct bootvar_io iovars;
+    void *rsdp;
+};
+
+#if defined(_KERNEL)
+
+off_t get_kernel_base(void);
+int bootvars_read(struct bootvars *bvp, int flags);
+
+#endif  /* _KERNEL */
+#endif  /* !_SYS_BOOTVARS_H_ */