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39 lines
1.5 KiB
39 lines
1.5 KiB
6 days ago
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#include <CoreFoundation/CoreFoundation.h>
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#include <IOKit/IOKitLib.h>
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#include <mach/mach.h>
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#include <stdio.h>
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#include <inttypes.h>
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static io_connect_t open_uc_by_name(const char *svc_name) {
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io_connect_t conn = IO_OBJECT_NULL;
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io_service_t service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceNameMatching(svc_name));
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if (!service) { fprintf(stderr, "service not found: %s\n", svc_name); return IO_OBJECT_NULL; }
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kern_return_t kr = IOServiceOpen(service, mach_task_self(), /*type*/0, &conn);
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IOObjectRelease(service);
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if (kr) { fprintf(stderr, "IOServiceOpen 0x%x\n", kr); return IO_OBJECT_NULL; }
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return conn;
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}
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int main(int argc, char **argv) {
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uint32_t bar = (argc > 1) ? (uint32_t)strtoul(argv[1], NULL, 0) : 0; // pick BAR index
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io_connect_t conn = open_uc_by_name("tinygpu");
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if (!conn) return 2;
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mach_vm_address_t addr = 0;
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mach_vm_size_t size = 0;
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kern_return_t kr = IOConnectMapMemory64(conn, bar, mach_task_self(), &addr, &size, kIOMapAnywhere);
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if (kr) { fprintf(stderr, "Map BAR%u failed 0x%x\n", bar, kr); IOServiceClose(conn); return 3; }
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printf("BAR%u mapped at 0x%llx, size 0x%llx\n", bar, (unsigned long long)addr, (unsigned long long)size);
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// example: read a 32-bit register at offset 0x0 (make sure it’s safe!)
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volatile uint32_t *mmio = (volatile uint32_t*)(uintptr_t)addr;
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uint32_t v = mmio[0];
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printf("mmio[0]=0x%08x\n", v);
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kr = IOConnectUnmapMemory64(conn, bar, mach_task_self(), addr);
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if (kr) fprintf(stderr, "Unmap failed 0x%x\n", kr);
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IOServiceClose(conn);
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return 0;
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}
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