bootldr.h

/* SPDX-License-Identifier: GPL-2.0+-with-RTEMS-exception */
 
/*
 *  bootldr.h -- Include file for bootloader.
 */
 
/*
 *  Copyright (C) 1998, 1999 Gabriel Paubert, paubert@iram.es
 *
 *  Modified to compile in RTEMS development environment
 *  by Eric Valette
 *
 *  Copyright (c) 1999 Eric Valette <eric.valette@free.fr>
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 */
 
#ifndef _PPC_BOOTLDR_H
#define _PPC_BOOTLDR_H
 
#ifndef ASM
#include <stdint.h>
#include <bsp/residual.h>
#include <bsp/consoleIo.h>
#include "pci.h"
 
#define abs __builtin_abs
 
#define PTE_REFD 0x100
#define PTE_CHNG (0x80|PTE_REFD)    /* Modified implies referenced */
#define PTE_WTHR 0x040
#define PTE_CINH 0x020
#define PTE_COHER 0x010
#define PTE_GUAR 0x008
#define PTE_RO   0x003
#define PTE_RW   0x002
 
#define PTE_RAM (PTE_CHNG|PTE_COHER|PTE_RW)
#define PTE_ROM (PTE_REFD|PTE_RO)
#define PTE_IO  (PTE_CHNG|PTE_CINH|PTE_GUAR|PTE_RW)
 
typedef struct {}opaque;
 
/* The context passed during MMU interrupts. */
typedef struct _ctxt {
    u_long lr, ctr;
    u_int cr, xer;
    u_long nip, msr;
    u_long regs[32];
} ctxt;
 
/* The main structure which is pointed to permanently by r13. Things
 * are not separated very well between parts because it would cause
 * too much code bloat for such a simple program like the bootloader.
 * The code is designed to be compiled with the -m relocatable option and
 * tries to minimize the number of relocations/fixups and the number of
 * functions who have to access the .got2 sections (this increases the
 * size of the prologue in every function).
 */
typedef struct _boot_data {
    RESIDUAL *residual;
    void *load_address;
        void *of_entry;
    void *r6, *r7, *r8, *r9, *r10;
    u_long cache_lsize;
    void *image;  /* Where to copy ourselves */
    void *stack;
    void *mover;  /* where to copy codemove to avoid overlays */
    u_long o_msr, o_hid0, o_r31;
    opaque * mm_private;
    const struct pci_bootloader_config_access_functions* pci_functions;
    opaque * pci_private;
    struct pci_dev * pci_devices;
    opaque * v86_private;
    char cmd_line[256];
} boot_data;
 
register boot_data *bd __asm__("r13");
 
static inline int
pcibios_read_config_byte(u_char bus, u_char dev_fn,
             u_char where, uint8_t *val) {
    return bd->pci_functions->read_config_byte(bus, dev_fn, where, val);
}
 
static inline int
pcibios_read_config_word(u_char bus, u_char dev_fn,
             u_char where, uint16_t *val) {
    return bd->pci_functions->read_config_word(bus, dev_fn, where, val);
}
 
static inline int
pcibios_read_config_dword(u_char bus, u_char dev_fn,
             u_char where, uint32_t *val) {
    return bd->pci_functions->read_config_dword(bus, dev_fn, where, val);
}
 
static inline int
pcibios_write_config_byte(u_char bus, u_char dev_fn,
             u_char where, uint8_t val) {
    return bd->pci_functions->write_config_byte(bus, dev_fn, where, val);
}
 
static inline int
pcibios_write_config_word(u_char bus, u_char dev_fn,
             u_char where, uint16_t val) {
    return bd->pci_functions->write_config_word(bus, dev_fn, where, val);
}
 
static inline int
pcibios_write_config_dword(u_char bus, u_char dev_fn,
             u_char where, uint32_t val) {
    return bd->pci_functions->write_config_dword(bus, dev_fn, where, val);
}
 
static inline int
pci_bootloader_read_config_byte(struct pci_dev *dev, u_char where, uint8_t *val) {
    return bd->pci_functions->read_config_byte(dev->bus->number,
                           dev->devfn,
                           where, val);
}
 
static inline int
pci_bootloader_read_config_word(struct pci_dev *dev, u_char where, uint16_t *val) {
    return bd->pci_functions->read_config_word(dev->bus->number,
                           dev->devfn,
                           where, val);
}
 
static inline int
pci_bootloader_read_config_dword(struct pci_dev *dev, u_char where, uint32_t *val) {
    return bd->pci_functions->read_config_dword(dev->bus->number,
                            dev->devfn,
                            where, val);
}
 
static inline int
pci_bootloader_write_config_byte(struct pci_dev *dev, u_char where, uint8_t val) {
    return bd->pci_functions->write_config_byte(dev->bus->number,
                            dev->devfn,
                            where, val);
}
 
static inline int
pci_bootloader_write_config_word(struct pci_dev *dev, u_char where, uint16_t val) {
    return bd->pci_functions->write_config_word(dev->bus->number,
                            dev->devfn,
                            where, val);
}
 
static inline int
pci_bootloader_write_config_dword(struct pci_dev *dev, u_char where, uint32_t val) {
    return bd->pci_functions->write_config_dword(dev->bus->number,
                             dev->devfn,
                             where, val);
}
 
/* codemove is like memmove, but it also gets the cache line size
 * as 4th parameter to synchronize them. If this last parameter is
 * zero, it performs more or less like memmove. No copy is performed if
 * source and destination addresses are equal. However the caches
 * are synchronized. Note that the size is always rounded up to the
 * next mutiple of 4.
 */
extern void * codemove(void *, const void *, size_t, unsigned long);
 
/* The physical memory allocator allows to align memory by
 * powers of 2 given by the lower order bits of flags.
 * By default it allocates from higher addresses towrds lower ones,
 * setting PA_LOW reverses this behaviour.
 */
 
#define palloc(size) __palloc(size,0)
 
#define isa_io_base (bd->io_base)
 
void * __palloc(u_long, int);
void  pfree(void *);
 
#define PA_LOW 0x100
#define PA_PERM 0x200       /* Not freeable by pfree */
#define PA_SUBALLOC 0x400   /* Allocate for suballocation by salloc */
#define PA_ALIGN_MASK 0x1f
 
void * valloc(u_long size);
void vfree(void *);
 
int vmap(void *, u_long, u_long);
void vunmap(void *);
 
void * salloc(u_long size);
void sfree(void *);
 
void pci_init(void);
 
void * memset(void *p, int c, size_t n);
 
void gunzip(void *, int, unsigned char *, int *);
 
void print_all_maps(const char *);
void print_hash_table(void);
void MMUon(void);
void MMUoff(void);
void hang(const char *, u_long, ctxt *) __attribute__((noreturn));
 
int init_v86(void);
void cleanup_v86_mess(void);
void em86_main(struct pci_dev *);
int find_max_mem(struct pci_dev *);
 
/*
 * Prototypes for calls from assembly and across files.
 */
typedef struct _x86 x86;
 
int em86_trap(x86 *p);
void decompress_kernel(int kernel_size, void * zimage_start, int len,
               void * initrd_start, int initrd_len );
void boot_udelay(uint32_t _microseconds);
void setup_hw(void);
void _handler(int vec, ctxt *p);
int early_setup(u_long image_size);
void mm_init(u_long image_size);
#endif
 
#ifdef ASM
/* These definitions simplify the ugly declarations necessary for
 * GOT definitions.
 */
 
#define GOT_ENTRY(NAME) .L_ ## NAME = . - .LCTOC1   ; .long NAME
#define GOT(NAME) .L_ ## NAME (r30)
 
#define START_GOT   \
    .section    ".got2","aw"; \
.LCTOC1 = .+ 0x8000
 
#define END_GOT \
    .text
 
#define GET_GOT \
    bl      1f; \
    .text   2; \
0:  .long   .LCTOC1-1f; \
    .text   ; \
1:  mflr    r30; \
    lwz r0,0b-1b(r30); \
        add r30,r0,r30
 
#define bd r13
#define cache_lsize 32  /* Offset into bd area */
#define image   36
#define stack   40
#define mover   44
#define o_msr   48
#define o_hid0  52
#define o_r31   56
/* Stack offsets for saved registers on exceptions */
#define save_lr    8(r1)
#define save_ctr  12(r1)
#define save_cr   16(r1)
#define save_xer  20(r1)
#define save_nip  24(r1)
#define save_msr  28(r1)
#define save_r(n) 32+4*n(r1)
#endif
 
#endif