mirror of
https://github.com/m-labs/artiq.git
synced 2024-12-05 01:36:39 +08:00
Sebastien Bourdeauducq
938e1c2842
The only advantage of UP is to support the Papilio Pro, but that port is also very limited in other ways and the Pipistrello provides a more reasonable platform that also supports AMP. On the other hand, RPCs on UP are difficult to implement with the session.c protocol system (without an operating system or coroutines), along with many other minor difficulties and maintainance issues. Planned features such as watchdogs in the core device are also difficult on UP.
106 lines
2.4 KiB
C
106 lines
2.4 KiB
C
#include <string.h>
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#include <generated/csr.h>
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#include "log.h"
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#include "mailbox.h"
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#include "elf_loader.h"
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#include "services.h"
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#include "kloader.h"
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static struct symbol symtab[128];
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static int _symtab_count;
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static char _symtab_strings[128*16];
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static char *_symtab_strptr;
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static void symtab_init(void)
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{
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memset(symtab, 0, sizeof(symtab));
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_symtab_count = 0;
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_symtab_strptr = _symtab_strings;
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}
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static int symtab_add(const char *name, void *target)
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{
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if(_symtab_count >= sizeof(symtab)/sizeof(symtab[0])) {
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log("Too many provided symbols in object");
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symtab_init();
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return 0;
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}
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symtab[_symtab_count].name = _symtab_strptr;
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symtab[_symtab_count].target = target;
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_symtab_count++;
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while(1) {
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if(_symtab_strptr >= &_symtab_strings[sizeof(_symtab_strings)]) {
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log("Provided symbol string table overflow");
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symtab_init();
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return 0;
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}
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*_symtab_strptr = *name;
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_symtab_strptr++;
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if(*name == 0)
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break;
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name++;
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}
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return 1;
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}
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int kloader_load(void *buffer, int length)
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{
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if(!kernel_cpu_reset_read()) {
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log("BUG: attempted to load while kernel CPU running");
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return 0;
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}
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symtab_init();
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return load_elf(
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resolve_service_symbol, symtab_add,
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buffer, length, (void *)KERNELCPU_PAYLOAD_ADDRESS, 4*1024*1024);
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}
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kernel_function kloader_find(const char *name)
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{
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return find_symbol(symtab, name);
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}
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extern char _binary_ksupport_bin_start;
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extern char _binary_ksupport_bin_end;
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static void start_kernel_cpu(void *addr)
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{
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memcpy((void *)KERNELCPU_EXEC_ADDRESS, &_binary_ksupport_bin_start,
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&_binary_ksupport_bin_end - &_binary_ksupport_bin_start);
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mailbox_acknowledge();
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mailbox_send(addr);
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kernel_cpu_reset_write(0);
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}
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void kloader_start_bridge(void)
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{
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start_kernel_cpu(NULL);
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}
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void kloader_start_user_kernel(kernel_function k)
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{
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if(!kernel_cpu_reset_read()) {
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log("BUG: attempted to start kernel CPU while already running (user kernel)");
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return;
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}
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start_kernel_cpu((void *)k);
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}
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void kloader_start_idle_kernel(void)
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{
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if(!kernel_cpu_reset_read()) {
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log("BUG: attempted to start kernel CPU while already running (idle kernel)");
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return;
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}
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/* TODO */
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}
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void kloader_stop_kernel(void)
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{
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kernel_cpu_reset_write(1);
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}
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