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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [hal/] [powerpc/] [mbx/] [v2_0/] [src/] [redboot_linux_exec.c] - Rev 27
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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 // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 2 or (at your option) any later version. // // eCos is distributed in the hope that it will be useful, but WITHOUT ANY // WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // // You should have received a copy of the GNU General Public License along // with eCos; if not, write to the Free Software Foundation, Inc., // 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 // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####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
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