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/* |
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* Cisco router simulation platform. |
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* Copyright (c) 2005,2006 Christophe Fillot. All rights reserved. |
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* |
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* Dallas DS1216 chip emulation: |
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* - NVRAM |
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* - Calendar |
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* |
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* Manuals: |
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* http://pdfserv.maxim-ic.com/en/ds/DS1216-DS1216H.pdf |
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* |
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* Calendar stuff written by Mtve. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include <time.h> |
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#include <errno.h> |
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#include "cpu.h" |
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#include "vm.h" |
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#include "dynamips.h" |
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#include "memory.h" |
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#include "device.h" |
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#define DEBUG_ACCESS 0 |
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/* SmartWatch pattern (p.5 of documentation) */ |
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#define PATTERN 0x5ca33ac55ca33ac5ULL |
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/* NVRAM private data */ |
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struct nvram_data { |
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vm_obj_t vm_obj; |
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struct vdevice dev; |
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char *filename; |
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u_int cal_state; |
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m_uint64_t cal_read,cal_write; |
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}; |
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/* Convert an 8-bit number to a BCD form */ |
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static m_uint8_t u8_to_bcd(m_uint8_t val) |
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{ |
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return(((val / 10) << 4) + (val % 10)); |
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} |
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/* Get the current time (p.8) */ |
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static m_uint64_t get_current_time(cpu_gen_t *cpu) |
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{ |
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m_uint64_t res; |
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struct tm *tmx; |
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time_t ct; |
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time(&ct); |
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tmx = localtime(&ct); |
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res = u8_to_bcd(tmx->tm_sec) << 8; |
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res += u8_to_bcd(tmx->tm_min) << 16; |
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res += u8_to_bcd(tmx->tm_hour) << 24; |
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res += ((m_uint64_t)(u8_to_bcd(tmx->tm_wday))) << 32; |
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res += ((m_uint64_t)(u8_to_bcd(tmx->tm_mday))) << 40; |
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res += ((m_uint64_t)(u8_to_bcd(tmx->tm_mon+1))) << 48; |
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res += ((m_uint64_t)(u8_to_bcd(tmx->tm_year))) << 56; |
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return(res); |
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} |
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/* |
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* dev_nvram_access() |
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*/ |
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void *dev_nvram_access(cpu_gen_t *cpu,struct vdevice *dev, |
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m_uint32_t offset,u_int op_size,u_int op_type, |
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m_uint64_t *data) |
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{ |
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struct nvram_data *d = dev->priv_data; |
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#if DEBUG_ACCESS |
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if (op_type == MTS_READ) |
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cpu_log(cpu,dev->name,"read access to offset=0x%x, pc=0x%llx\n", |
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offset,cpu_get_pc(cpu)); |
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else |
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cpu_log(cpu,dev->name, |
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"write access to vaddr=0x%x, pc=0x%llx, val=0x%llx\n", |
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offset,cpu_get_pc(cpu),*data); |
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#endif |
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switch(offset) { |
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case 0x03: |
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if (op_type == MTS_READ) { |
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*data = d->cal_read & 1; |
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d->cal_read >>= 1; |
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} else { |
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d->cal_write >>= 1; |
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d->cal_write |= *data << 63; |
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if (d->cal_write == PATTERN) { |
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d->cal_state = 1; |
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vm_log(cpu->vm,"Calendar","reset\n"); |
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d->cal_read = get_current_time(cpu); |
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} else if(d->cal_state > 0 && d->cal_state++ == 64) { |
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/* untested */ |
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vm_log(cpu->vm,"Calendar","set 0x%016llx\n",d->cal_write); |
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d->cal_state = 0; |
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} |
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} |
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return NULL; |
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} |
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return((void *)(dev->host_addr + offset)); |
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} |
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/* Set appropriately the config register if the NVRAM is empty */ |
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static void set_config_register(struct vdevice *dev,u_int *conf_reg) |
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{ |
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m_uint32_t *ptr; |
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int i; |
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ptr = (m_uint32_t *)dev->host_addr; |
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for(i=0;i<(dev->phys_len/4);i++,ptr++) |
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if (*ptr) return; |
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/* |
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* nvram is empty: tells IOS to ignore its contents. |
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* http://www.cisco.com/en/US/products/hw/routers/ps274/products_installation_guide_chapter09186a008007de4c.html |
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*/ |
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*conf_reg |= 0x0040; |
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printf("NVRAM is empty, setting config register to 0x%x\n",*conf_reg); |
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} |
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/* Shutdown the NVRAM device */ |
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void dev_nvram_shutdown(vm_instance_t *vm,struct nvram_data *d) |
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{ |
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if (d != NULL) { |
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/* Remove the device */ |
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dev_remove(vm,&d->dev); |
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/* We don't remove the file, since it used as permanent storage */ |
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if (d->filename) |
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free(d->filename); |
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/* Free the structure itself */ |
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free(d); |
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} |
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} |
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/* Create the NVRAM device */ |
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int dev_nvram_init(vm_instance_t *vm,char *name, |
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m_uint64_t paddr,m_uint32_t len, |
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u_int *conf_reg) |
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{ |
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struct nvram_data *d; |
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u_char *ptr; |
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/* allocate the private data structure */ |
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if (!(d = malloc(sizeof(*d)))) { |
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fprintf(stderr,"NVRAM: out of memory\n"); |
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return(-1); |
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} |
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memset(d,0,sizeof(*d)); |
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vm_object_init(&d->vm_obj); |
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d->vm_obj.name = name; |
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d->vm_obj.data = d; |
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d->vm_obj.shutdown = (vm_shutdown_t)dev_nvram_shutdown; |
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if (!(d->filename = vm_build_filename(vm,name))) { |
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fprintf(stderr,"NVRAM: unable to create filename.\n"); |
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return(-1); |
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} |
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dev_init(&d->dev); |
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d->dev.name = name; |
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d->dev.phys_addr = paddr; |
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d->dev.phys_len = len; |
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d->dev.handler = dev_nvram_access; |
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d->dev.fd = memzone_create_file(d->filename,d->dev.phys_len,&ptr); |
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d->dev.host_addr = (m_iptr_t)ptr; |
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d->dev.flags = VDEVICE_FLAG_NO_MTS_MMAP|VDEVICE_FLAG_SYNC; |
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d->dev.priv_data = d; |
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if (d->dev.fd == -1) { |
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fprintf(stderr,"NVRAM: unable to map file '%s'\n",d->filename); |
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return(-1); |
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} |
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/* Modify the configuration register if NVRAM is empty */ |
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set_config_register(&d->dev,conf_reg); |
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/* Map this device to the VM */ |
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vm_bind_device(vm,&d->dev); |
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vm_object_add(vm,&d->vm_obj); |
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return(0); |
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} |
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/* Compute NVRAM checksum */ |
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m_uint16_t nvram_cksum_old(vm_instance_t *vm,m_uint64_t addr,size_t count) |
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{ |
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m_uint32_t sum = 0; |
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while(count > 1) { |
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sum = sum + physmem_copy_u16_from_vm(vm,addr); |
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addr += sizeof(m_uint16_t); |
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count -= sizeof(m_uint16_t); |
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} |
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if (count > 0) |
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sum = sum + ((physmem_copy_u16_from_vm(vm,addr) & 0xFF) << 8); |
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while(sum>>16) |
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sum = (sum & 0xffff) + (sum >> 16); |
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return(~sum); |
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} |