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//==========================================================================

//

//      redboot_linux_boot.c

//

//      RedBoot command to boot Linux

//

//==========================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

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// You should have received a copy of the GNU General Public License along

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// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

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// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//####OTHERCOPYRIGHTBEGIN####

//

//  The structure definitions below are taken from include/asm-ppc/mbx.h in

//  the Linux kernel, Copyright (c) 1997 Dan Malek. Their presence

//  here is for the express purpose of communication with the Linux kernel

//  being booted and is considered 'fair use' by the original author and

//  are included with his permission.

//

//####OTHERCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    msalter

// Contributors: gthomas,msalter

// Date:         2002-01-14

// Purpose:      

// Description:  

//              

// This code is part of RedBoot (tm).

//

//####DESCRIPTIONEND####

//

//==========================================================================

#include <redboot.h>

#include CYGBLD_HAL_TARGET_H

#include CYGBLD_HAL_PLATFORM_H

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_cache.h>

#ifdef CYGSEM_REDBOOT_HAL_LINUX_BOOT

#include CYGHWR_MEMORY_LAYOUT_H

//=========================================================================

// Exported CLI function(s)

static void do_exec(int argc, char *argv[]);

RedBoot_cmd("exec",

            "Execute an image - with MMU off",

            "[-w timeout]\n"

            "        [-r <ramdisk addr> [-s <ramdisk length>]]\n"

            "        [-c \"kernel command line\"] [<entry_point>]",

            do_exec

    );

//=========================================================================

// Imported from Linux kernel include/asm-ppc/mbx.h

//   Copyright (c) 1997 Dan Malek (dmalek@jlc.net)

//   Used with permission of author.

/* A Board Information structure that is given to a program when

 * EPPC-Bug starts it up.

 */

typedef struct bd_info {

        unsigned int    bi_tag;         /* Should be 0x42444944 "BDID" */

        unsigned int    bi_size;        /* Size of this structure */

        unsigned int    bi_revision;    /* revision of this structure */

        unsigned int    bi_bdate;       /* EPPCbug date, i.e. 0x11061997 */

        unsigned int    bi_memstart;    /* Memory start address */

        unsigned int    bi_memsize;     /* Memory (end) size in bytes */

        unsigned int    bi_intfreq;     /* Internal Freq, in Hz */

        unsigned int    bi_busfreq;     /* Bus Freq, in Hz */

        unsigned int    bi_clun;        /* Boot device controller */

        unsigned int    bi_dlun;        /* Boot device logical dev */

        /* These fields are not part of the board information structure

         * provided by the boot rom.  They are filled in by embed_config.c

         * so we have the information consistent with other platforms.

         */

        unsigned char   bi_enetaddr[6];

        unsigned int    bi_baudrate;

} bd_t;

/* Memory map for the MBX as configured by EPPC-Bug.  We could reprogram

 * The SIU and PCI bridge, and try to use larger MMU pages, but the

 * performance gain is not measureable and it certainly complicates the

 * generic MMU model.

 *

 * In a effort to minimize memory usage for embedded applications, any

 * PCI driver or ISA driver must request or map the region required by

 * the device.  For convenience (and since we can map up to 4 Mbytes with

 * a single page table page), the MMU initialization will map the

 * NVRAM, Status/Control registers, CPM Dual Port RAM, and the PCI

 * Bridge CSRs 1:1 into the kernel address space.

 */

#define PCI_ISA_IO_ADDR         ((unsigned)0x80000000)

#define PCI_ISA_IO_SIZE         ((unsigned int)(512 * 1024 * 1024))

#define PCI_IDE_ADDR            ((unsigned)0x81000000)

#define PCI_ISA_MEM_ADDR        ((unsigned)0xc0000000)

#define PCI_ISA_MEM_SIZE        ((unsigned int)(512 * 1024 * 1024))

#define PCMCIA_MEM_ADDR         ((unsigned int)0xe0000000)

#define PCMCIA_MEM_SIZE         ((unsigned int)(64 * 1024 * 1024))

#define PCMCIA_DMA_ADDR         ((unsigned int)0xe4000000)

#define PCMCIA_DMA_SIZE         ((unsigned int)(64 * 1024 * 1024))

#define PCMCIA_ATTRB_ADDR       ((unsigned int)0xe8000000)

#define PCMCIA_ATTRB_SIZE       ((unsigned int)(64 * 1024 * 1024))

#define PCMCIA_IO_ADDR          ((unsigned int)0xec000000)

#define PCMCIA_IO_SIZE          ((unsigned int)(64 * 1024 * 1024))

#define NVRAM_ADDR              ((unsigned int)0xfa000000)

#define NVRAM_SIZE              ((unsigned int)(1 * 1024 * 1024))

#define MBX_CSR_ADDR            ((unsigned int)0xfa100000)

#define MBX_CSR_SIZE            ((unsigned int)(1 * 1024 * 1024))

#define IMAP_ADDR               ((unsigned int)0xfa200000)

#define IMAP_SIZE               ((unsigned int)(64 * 1024))

#define PCI_CSR_ADDR            ((unsigned int)0xfa210000)

#define PCI_CSR_SIZE            ((unsigned int)(64 * 1024))

/* Map additional physical space into well known virtual addresses.  Due

 * to virtual address mapping, these physical addresses are not accessible

 * in a 1:1 virtual to physical mapping.

 */

#define ISA_IO_VIRT_ADDR        ((unsigned int)0xfa220000)

#define ISA_IO_VIRT_SIZE        ((unsigned int)64 * 1024)

/* Interrupt assignments.

 * These are defined (and fixed) by the MBX hardware implementation.

 */

#define POWER_FAIL_INT  SIU_IRQ0        /* Power fail */

#define TEMP_HILO_INT   SIU_IRQ1        /* Temperature sensor */

#define QSPAN_INT       SIU_IRQ2        /* PCI Bridge (DMA CTLR?) */

#define ISA_BRIDGE_INT  SIU_IRQ3        /* All those PC things */

#define COMM_L_INT      SIU_IRQ6        /* MBX Comm expansion connector pin */

#define STOP_ABRT_INT   SIU_IRQ7        /* Stop/Abort header pin */

/* The MBX uses the 8259.

*/

#define NR_8259_INTS    16

// End of imported data/structures

//=========================================================================

#define MBX_CSR_COM1            0x02  // COM1 enabled

//

// Execute a Linux kernel - this is a RedBoot CLI command

//

static void

do_exec(int argc, char *argv[])

{

    unsigned long entry;

    bool wait_time_set;

    int  wait_time;

    bool cmd_line_set, ramdisk_addr_set, ramdisk_size_set;

    unsigned long ramdisk_addr, ramdisk_size;

    char *cmd_line;

    char *cline;

    struct option_info opts[6];

    bd_t *board_info;

    CYG_INTERRUPT_STATE oldints;

    unsigned long sp = CYGMEM_REGION_ram+CYGMEM_REGION_ram_SIZE;

    init_opts(&opts[0], 'w', true, OPTION_ARG_TYPE_NUM,

              (void **)&wait_time, (bool *)&wait_time_set, "wait timeout");

    init_opts(&opts[1], 'c', true, OPTION_ARG_TYPE_STR,

              (void **)&cmd_line, (bool *)&cmd_line_set, "kernel command line");

    init_opts(&opts[2], 'r', true, OPTION_ARG_TYPE_NUM,

              (void **)&ramdisk_addr, (bool *)&ramdisk_addr_set, "ramdisk_addr");

    init_opts(&opts[3], 's', true, OPTION_ARG_TYPE_NUM,

              (void **)&ramdisk_size, (bool *)&ramdisk_size_set, "ramdisk_size");

    if (!scan_opts(argc, argv, 1, opts, 4, (void *)&entry, OPTION_ARG_TYPE_NUM,

                   "[physical] starting address"))

    {

        return;

    }

    // Make a little space at the top of the stack, and align to

    // 64-bit boundary.

    sp = (sp-8) & ~7;

    // Set up parameter struct at top of stack

    sp = sp-sizeof(bd_t);

    board_info = (bd_t *)sp;

    board_info->bi_tag          = 0x42444944;

    board_info->bi_size         = sizeof(board_info);

    board_info->bi_revision     = 1;

    board_info->bi_bdate        = 0x11061997;

    board_info->bi_memstart     = CYGMEM_REGION_ram;

    board_info->bi_memsize      = CYGMEM_REGION_ram_SIZE;

    board_info->bi_intfreq      = CYGHWR_HAL_POWERPC_BOARD_SPEED;

    board_info->bi_busfreq      = 66; // ????

    board_info->bi_clun         = 0;  // ????

    board_info->bi_dlun         = 0;  // ????

    // Copy the commandline onto the stack, and set the SP to just below it.

    // If no cmd_line set in args, set it to empty string.

    if( !cmd_line_set )

        cmd_line = "";

    {

        int len,i;

        // get length of string

        for( len = 0; cmd_line[len] != '\0'; len++ );

        // decrement sp by length of string and align to

        // word boundary.

        sp = (sp-(len+1)) & ~3;

        // assign this SP value to command line start

        cline = (char *)sp;

        // copy command line over.

        for( i = 0; i < len; i++ )

            cline[i] = cmd_line[i];

        cline[len] = '\0';

        // adjust SP to 64 bit boundary, and leave a little space

        // between it and the commandline for PowerPC calling

        // conventions.

        sp = (sp-32)&~7;

    }

    // Disable interrupts

    HAL_DISABLE_INTERRUPTS(oldints);

    // Put the caches to sleep.

    HAL_DCACHE_SYNC();

    HAL_ICACHE_DISABLE();

    HAL_DCACHE_DISABLE();

    HAL_DCACHE_SYNC();

    HAL_ICACHE_INVALIDATE_ALL();

    HAL_DCACHE_INVALIDATE_ALL();

//    diag_printf("entry %08x sp %08x bi %08x cl %08x\n",

//              entry,sp,board_info,cline);

//    breakpoint();

    // Call into Linux

    *(volatile unsigned char *)MBX_CSR_ADDR |= MBX_CSR_COM1;  // Magic that says COM1 enabled

    __asm__ volatile (

                       // Linux seems to want the I/O mapped at 0xFA200000

                       "lis     3,0xFA20\n"

                       "mtspr   638,3\n"

                       // Start by disabling MMU - the mappings are

                       // 1-1 so this should not cause any problems

                       "mfmsr   3\n"

                       "li      4,0xFFFFFFCF\n"

                       "and     3,3,4\n"

                       "sync\n"

                       "mtmsr   3\n"

                       "sync\n"

                       // Now set up parameters to jump into linux

                       "mtlr    %0\n"           // set entry address in LR

                       "mr      1,%1\n"         // set stack pointer

                       "mr      3,%2\n"         // set board info in R3

                       "mr      4,%3\n"         // set command line in R4

                       "blr          \n"        // jump into linux

                       :

                       : "r"(entry),"r"(sp),"r"(board_info),"r"(cline)

                       : "r3", "r4"

                     );

}

#endif // CYGSEM_REDBOOT_HAL_LINUX_BOOT

//=========================================================================

// EOF redboot_linux_exec.c