/* SPDX-License-Identifier: GPL-2.0 */
/*
 *  linux/arch/nds32/include/asm/setup.h
 *
 * Copyright (C) 1997-1999 Russell King
 * Copyright (C) 2008 Andes Technology Corporation
 * Copyright (C) 2013 Ken Kuo (ken_kuo@andestech.com)
 * Copyright (C) 2017 Rick Chen (rick@andestech.com)
 *
 *  Structure passed to kernel to tell it about the
 *  hardware it's running on.  See Documentation/arm/Setup
 *  for more info.
 */
#ifndef __RISCV_SETUP_H
#define __RISCV_SETUP_H

#define COMMAND_LINE_SIZE 256

/* The list ends with an ATAG_NONE node. */
#define ATAG_NONE       0x00000000

struct tag_header {
        u32 size;
        u32 tag;
};

/* The list must start with an ATAG_CORE node */
#define ATAG_CORE       0x54410001

struct tag_core {
        u32 flags;              /* bit 0 = read-only */
        u32 pagesize;
        u32 rootdev;
};

/* it is allowed to have multiple ATAG_MEM nodes */
#define ATAG_MEM        0x54410002

struct tag_mem32 {
        u32     size;
        u32     start;  /* physical start address */
};

/* VGA text type displays */
#define ATAG_VIDEOTEXT  0x54410003

struct tag_videotext {
        u8              x;
        u8              y;
        u16             video_page;
        u8              video_mode;
        u8              video_cols;
        u16             video_ega_bx;
        u8              video_lines;
        u8              video_isvga;
        u16             video_points;
};

/* describes how the ramdisk will be used in kernel */
#define ATAG_RAMDISK    0x54410004

struct tag_ramdisk {
        u32 flags;      /* bit 0 = load, bit 1 = prompt */
        u32 size;       /* decompressed ramdisk size in _kilo_ bytes */
        u32 start;      /* starting block of floppy-based RAM disk image */
};

/*
 * this one accidentally used virtual addresses - as such,
 * it's deprecated.
 * describes where the compressed ramdisk image lives (virtual address)
 */
#define ATAG_INITRD             0x54410005

/* describes where the compressed ramdisk image lives (physical address) */
#define ATAG_INITRD2    0x54420005

struct tag_initrd {
        u32 start;      /* physical start address */
        u32 size;       /* size of compressed ramdisk image in bytes */
};

/* board serial number. "64 bits should be enough for everybody" */
#define ATAG_SERIAL             0x54410006

struct tag_serialnr {
        u32 low;
        u32 high;
};

/* board revision */
#define ATAG_REVISION   0x54410007

struct tag_revision {
        u32 rev;
};

/* initial values for vesafb-type framebuffers. see struct screen_info
 * in include/linux/tty.h
 */
#define ATAG_VIDEOLFB   0x54410008

struct tag_videolfb {
        u16             lfb_width;
        u16             lfb_height;
        u16             lfb_depth;
        u16             lfb_linelength;
        u32             lfb_base;
        u32             lfb_size;
        u8              red_size;
        u8              red_pos;
        u8              green_size;
        u8              green_pos;
        u8              blue_size;
        u8              blue_pos;
        u8              rsvd_size;
        u8              rsvd_pos;
};

/* command line: \0 terminated string */
#define ATAG_CMDLINE    0x54410009

struct tag_cmdline {
        char    cmdline[COMMAND_LINE_SIZE];
};

struct tag {
        struct tag_header hdr;
        union {
                struct tag_core         core;
                struct tag_mem32        mem;
                struct tag_videotext    videotext;
                struct tag_ramdisk      ramdisk;
                struct tag_initrd       initrd;
                struct tag_serialnr     serialnr;
                struct tag_revision     revision;
                struct tag_videolfb     videolfb;
                struct tag_cmdline      cmdline;
        } u;
};

struct tagtable {
        u32 tag;
        int (*parse)(const struct tag *);
};

#define tag_member_present(_tag, member)                                \
        typeof(_tag) (tag) = (_tag); \
        ((unsigned long)(&((struct tag *)0L)->member + 1)       \
                <= (tag)->hdr.size * 4)

#define tag_next(_t)    \
        typeof(_t) (t) = (_t); \
        ((struct tag *)((u32 *)(t) + (t)->hdr.size))
#define tag_size(type)  ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)

#define for_each_tag(_t, base) \
        typeof(_t) (t) = (_t); \
        for (t = base; t->hdr.size; t = tag_next(t))

#ifdef __KERNEL__

#define __tag __used __attribute__((__section__(".taglist")))
#define __tagtable(tag, fn) \
static struct tagtable __tagtable_##fn __tag = { tag, fn }

/*
 * Memory map description
 */
#define NR_BANKS 8

struct meminfo {
        int nr_banks;
        struct {
                unsigned long start;
                unsigned long size;
                int           node;
        } bank[NR_BANKS];
};

/*
 * Early command line parameters.
 */
struct early_params {
        const char *arg;
        void (*fn)(char **p);
};

#define __early_param(name, fn)                                 \
static struct early_params __early_##fn __used  \
__attribute__((__section__("__early_param"))) = { name, fn }

#endif
#endif