Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
branch: master
Fetching contributors…

Octocat-spinner-32-eaf2f5

Cannot retrieve contributors at this time

file 646 lines (525 sloc) 21.075 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645
#include "chain.h"

#define put(x) do { serial_putstring(#x ": "); serial_puthex((uint32_t) x); serial_putstring("\n"); } while(0)

#define CMD_ITERATE(hdr, cmd) for(struct load_command *cmd = (void *)((hdr) + 1), *end = (void *)((char *)(hdr) + (hdr)->sizeofcmds); cmd; cmd = (cmd->cmdsize > 0 && cmd->cmdsize < (uint32_t)((char *)end - (char *)cmd)) ? (void *)((char *)cmd + cmd->cmdsize) : NULL)

extern int (*PE_halt_restart)(unsigned int type);
extern int PEHaltRestart(unsigned int type);
#define kPEHaltCPU 0
#define kPERestartCPU 1

static struct mach_header *kern_hdr;
static size_t kern_size;
static char *devicetree;
static size_t devicetree_size;

static volatile char *vic;
static struct boot_args *args_final;
static char *devicetree_final;
static uint32_t *pagetable_final;
    
static struct boot_args args_storage;
// WARNING WARNING WARNING WARNING
// If you use __attribute__((aligned)), you can get a binary like this:
// http://pastie.org/private/qamosrgse9ufzsxsvyehaw
// The section is outside of the segment!
// To easily see if that's happening, run check_sanity from the data repository.

static char *pagetable_storage;

struct boot_args {
    uint16_t something; // 0 - 1
    uint16_t epoch; // 2 - must be 2 (6 on iPhone1,2 etc...?)
    uint32_t virtbase; // 4
    uint32_t physbase; // 8
    uint32_t size; // c
    uint32_t pt_paddr; // 10: | 0x18 (eh, but we're 0x4000 off) -> ttbr1
    uint32_t v_baseAddr; // 14 (-> PE_state+4 - v_baseAddr) 5f700000
    uint32_t v_display; // 18 (-> PE_state+0x18 - v_display) 1
    uint32_t v_rowBytes; // 1c (-> PE_state+8 - v_rowBytes) 2560
    uint32_t v_width; // 20 (-> PE_state+0xc - v_width) 640
    uint32_t v_height; // 24 (-> PE_state+0x10 - v_height) 960
    uint32_t v_depth; // 28 (-> PE_state+0x14 - v_depth) 65568?
    uint32_t unk2c; // 2c
    char *dt_vaddr; // 30 (-> PE_state+0x6c)
    uint32_t dt_size; // 34
    char cmdline[]; // 38
} __attribute__((packed));

struct memory_map_entry {
    void *address;
    uint32_t size;
} __attribute__((packed));

static const char *placeholders[] = {
    "MemoryMapReserved-0",
    "MemoryMapReserved-1",
    "MemoryMapReserved-2",
    "MemoryMapReserved-3",
    "MemoryMapReserved-4",
    "MemoryMapReserved-5",
    "MemoryMapReserved-6",
    "MemoryMapReserved-7",
    "MemoryMapReserved-8",
    "MemoryMapReserved-9",
    "MemoryMapReserved-10",
    "MemoryMapReserved-11",
    "MemoryMapReserved-12",
    "MemoryMapReserved-13",
    "MemoryMapReserved-14",
    "MemoryMapReserved-15"
};
static const char **placeholders_p;

__attribute__((always_inline)) static inline void invalidate_tlb() {
    asm volatile("mov r2, #0;"
                 "mcr p15, 0, r2, c8, c7, 0;" // invalidate entire unified TLB
                 "mcr p15, 0, r2, c8, c6, 0;" // invalidate entire data TLB
                 "mcr p15, 0, r2, c8, c5, 0;" // invalidate entire instruction TLB
                 "mcr p15, 0, r2, c7, c10, 4;" // DSB
                 "mcr p15, 0, r2, c7, c5, 4;" // ISB
                 "mcr p15, 0, r2, c7, c5, 6;" // branch predictor
                 ::: "r2");
}

static void flush_cache(void *start, size_t size) {
    // flush/invalidate
    uint32_t start_ = (uint32_t) start;
    for(uint32_t addr = (start_ & ~0x3f); addr < (start_ + size); addr += 0x40) {
        asm volatile("mcr p15, 0, %0, c7, c14, 1" :: "r"(addr));
        asm volatile("mcr p15, 0, %0, c7, c5, 1" :: "r"(addr));
    }
}

__attribute__((noreturn))
static void vita(uint32_t args_phys, uint32_t jump_phys) {
    //serial_putstring("vita\n");
    asm volatile("mcr p15, 0, r2, c7, c5, 0;" // redundantly kill icache
                 "mrc p15, 0, r2, c1, c0, 0;"
                 "bic r2, #0x1000;"
                 "bic r2, #0x7;"
                 "mcr p15, 0, r2, c1, c0, 0;"
                 // http://lists.infradead.org/pipermail/barebox/2010-January/000528.html
                 ::: "r2");

     
    invalidate_tlb();
    
    // This appears to work (and avoid GCC complaining about noreturn functions returning), but it also generates a warning. I don't know how to get rid of it.
    //((void (__attribute__((noreturn)) *)(uint32_t)) jump_phys)(args_phys);
    __attribute__((noreturn)) void (*ptr)(uint32_t) = (void *) jump_phys;
    ptr(args_phys);
}

static int phase_2(unsigned int type);

static void *allocate_memory_area(char *memory_map_entry, const char *name, size_t size) {
    uint32_t max = 0, *max_p = &max;

    char *e = memory_map_entry;
    dt_prop_iterate(&e, ^bool(char *name, char *value, size_t l) {
        if(strcmp(name, "name") && strcmp(name, "AAPL,phandle")) {
            struct memory_map_entry *entry = (void *) value;
            uint32_t new_max = (uint32_t) entry->address + entry->size;
            if(new_max > *max_p) *max_p = new_max;
        }
        return true;
    });
    
    max = (max + 0x3fff) & ~0x3fff;

    struct memory_map_entry new;
    new.address = (void *) max;
    new.size = size;

    if(!dt_entry_set_prop(memory_map_entry, *placeholders_p++, name, &new, sizeof(new))) {
        IOLog("Could not put %s in memory map\n", name);
        return NULL;
    }

    return (void *) phys_to_virt(max);
}

static struct boot_args *find_orig_args() {
    uint32_t pt_phys;
    asm("mrc p15, 0, %0, c2, c0, 1" :"=r"(pt_phys)); // ttbr1
    struct boot_args *oa = (void *) (pt_phys + 0x40000000);
    for(int i = 0; i < 0x10000; i++) {
        if((oa->virtbase == 0x80000000 || oa->virtbase == 0xc0000000) && \
           oa->physbase == 0x40000000 && \
           oa->v_rowBytes == oa->v_width * 4) {
            return oa;
        }
        oa = (void *) (((uint32_t *) oa) - 1);
    }

    IOLog("Could not find orig_args\n");
    return NULL;
}

static void place_putc();

static int phase_1() {
    if(!(vic = map_from_iokit("vic"))) return -1;

    uart_set_rate(115200);

    serial_putstring("Hello... I am at ");
    serial_puthex((uint32_t) phase_1);
    serial_putstring(" aka ");
    serial_puthex(virt_to_phys(phase_1));
    serial_putstring("\n");

    trace;

    char *dt;
    
    dt = devicetree;
    dt_super_iterate(&dt);
    
    // XXX compatibility of the frequency thing?
    
    uint32_t frequency = 0;
    if(!dt_entry_set_prop(devicetree, "clock-frequency", NULL, &frequency, sizeof(frequency))) {
        IOLog("couldn't set /clock-frequency to 0\n");
        return -1;
    }

    trace;
    
    dt = devicetree;
    char *cpus = dt_get_entry(&dt, "IODeviceTree:/cpus/cpu0");
    if(!cpus) {
        IOLog("couldn't get /cpus/cpu0\n");
        return -1;
    }

    frequency = 200000000;
    if(!dt_entry_set_prop(cpus, "memory-frequency", NULL, &frequency, sizeof(frequency))) {
        IOLog("couldn't set /cpus/cpu0/memory-frequency\n");
        return -1;
    }
    
    frequency = 800000000;
    if(!dt_entry_set_prop(cpus, "clock-frequency", NULL, &frequency, sizeof(frequency))) {
        IOLog("couldn't set /cpus/cpu0/clock-frequency\n");
        return -1;
    }

    trace;
#if PUTC
    trace;

    dt = devicetree;
    char *usb_complex_entry = dt_get_entry(&dt, "IODeviceTree:/arm-io/usb-complex");
    if(!usb_complex_entry || !dt_entry_set_prop(usb_complex_entry, "compatible", NULL, "", 1)) {
        IOLog("wtf usb-complex\n");
        return -1;
    }

    dt = devicetree;
    char *usb_device_entry = dt_get_entry(&dt, "IODeviceTree:/arm-io/usb-complex/usb-device");
    if(!usb_device_entry || !dt_entry_set_prop(usb_device_entry, "compatible", NULL, "", 1)) {
        IOLog("wtf usb-device\n");
        return -1;
    }
#endif
    
    trace;

    dt = devicetree;
    char *chosen_entry = dt_get_entry(&dt, "IODeviceTree:/chosen");
    if(!chosen_entry || !dt_entry_set_prop(chosen_entry, "debug-enabled", NULL, "\x01\x00\x00\x00", 4)) {
        IOLog("wtf chosen\n");
        return -1;
    }
    
    dt = devicetree;
    char *memory_map_entry = dt_get_entry(&dt, "IODeviceTree:/chosen/memory-map");
    if(!memory_map_entry) {
        IOLog("wtf memory-map\n");
        return -1;
    }
    
    placeholders_p = &placeholders[0];
    
    trace;
    
    CMD_ITERATE(kern_hdr, cmd) {
        if(cmd->cmd == LC_SEGMENT) {
            struct segment_command *seg = (void *) cmd;
            // update the devicetree
            static char buf[32] = "Kernel-";
            my_memcpy(buf + 7, seg->segname, 16);
            struct memory_map_entry s;
            s.address = (void *) virt_to_phys((void *) seg->vmaddr);
            s.size = seg->vmsize;
            dt_entry_set_prop(memory_map_entry, *placeholders_p++, buf, &s, sizeof(s));
        }
    }
    
    trace;

    args_final = allocate_memory_area(memory_map_entry, "BootArgs", 0x1000);
    devicetree_final = allocate_memory_area(memory_map_entry, "DeviceTree", devicetree_size);
    pagetable_final = allocate_memory_area(memory_map_entry, "PageTable", 0x4000);

    trace;

    put(args_final);
    put(devicetree_final);
    put(pagetable_final);

    if(!args_final || !devicetree_final || !pagetable_final) {
        return -1;
    }
    
    uint32_t ttbr1;
    asm("mrc p15, 0, %0, c2, c0, 1" :"=r"(ttbr1));
    uint32_t *orig_pt = phys_to_virt(ttbr1 & ~0x3fff);
    put(orig_pt);
    put(pagetable_storage);
    my_memcpy(pagetable_storage, orig_pt, 0x4000);

    struct boot_args *orig_args = find_orig_args();
    if(!orig_args) return -1;
    put(orig_args);
    my_memcpy(&args_storage, orig_args, sizeof(struct boot_args));
    serial_putstring("ok\n");


#if 0
    serial_important = true;
    serial_putstring("New DeviceTree:\n");
    serial_puthexbuf((void *) devicetree, 0xde78);
    serial_putstring("\n");
    serial_important = false;
#endif

#if !DEBUG
    serial_putstring("calling PEHaltRestart\n");

    PE_halt_restart = phase_2;
    PEHaltRestart(kPERestartCPU);
#else
    serial_putstring("going directly to phase_2\n");
    phase_2(0x1234);
#endif

    return 0;
}

#if DEBUG || PUTC
static void place_thing(const void *start, const void *end, uint32_t addr, uint32_t hookaddr) {
    uint32_t s = (uint32_t) start;
    uint32_t e = (uint32_t) end;
    bool thing_thumb = false;
    if(s & 1) {
        s &= ~1;
        start = (void *) s;
        thing_thumb = true;
    }
    if(addr & 1) {
        addr &= ~1;
        thing_thumb = true;
    }
    my_memcpy((void *) addr, start, e - s);
    if(thing_thumb) {
        addr |= 1;
    }
    uint32_t jump_to_fu_arm[] = {0xe51ff004, addr};
    uint16_t jump_to_fu_thumb_al4[] = {0xf8df, 0xf000, addr & 0xffff, addr >> 16};
    uint16_t jump_to_fu_thumb_notal4[] = {0xbf00, 0xf8df, 0xf000, addr & 0xffff, addr >> 16};
    switch(hookaddr & 3) {
    case 1:
        my_memcpy((void *) (hookaddr - 1), jump_to_fu_thumb_al4, sizeof(jump_to_fu_thumb_al4));
        break;
    case 3:
        my_memcpy((void *) (hookaddr - 1), jump_to_fu_thumb_notal4, sizeof(jump_to_fu_thumb_notal4));
        break;
    case 0:
    case 2:
        my_memcpy((void *) hookaddr, jump_to_fu_arm, sizeof(jump_to_fu_arm));
        break;
    }
}

static void place_annoyance(uint32_t addr, uint32_t hookaddr, uint32_t hooksize) {
    if(hookaddr & 1) {
        if(hooksize > 16 || hooksize < (((hookaddr & 3) == 3) ? 10 : 8)) {
            serial_putstring("place_annoyance: hooksize is wrong\n");
            return;
        }

        extern void annoyance_start(), annoyance_end();
        extern char annoyance_space[];
        extern void *annoyance_iolog, *annoyance_come_from, *annoyance_return_to;
        my_memset(annoyance_space, 0, 16);
        my_memcpy(annoyance_space, (void *) (hookaddr - 1), hooksize);
        annoyance_iolog = IOLog;
        annoyance_come_from = (void *) hookaddr;
        annoyance_return_to = (void *) (hookaddr + hooksize);

        place_thing(annoyance_start, annoyance_end, addr | 1, hookaddr);
    } else {
        serial_important = true;
        serial_putstring("place_annoyance: not thumb\n");
        serial_important = false;
    }
}

static void place_blxsp(uint32_t addr) {
    if(addr & 1) {
        *((uint16_t *) (addr - 1)) = 0x47e8;
    } else {
        *((uint32_t *) addr) = 0xe12fff3d;
    }
}
#endif // DEBUG || PUTC

#if PUTC
static void place_putc() {
    extern void putc_start(), putc_end();
    place_thing(putc_start, putc_end, SCRATCH, CONSLOG_PUTC);
    place_thing(putc_start, putc_end, SCRATCH, CONSDEBUG_PUTC);
    place_thing(putc_start, putc_end, SCRATCH, PUTCHAR);
    place_thing(putc_start, putc_end, SCRATCH, CNPUTC);
}
#endif

static int phase_2(unsigned int type) {
    // no kanye
    asm volatile("cpsid if");

    // stuff from openiboot
    for(int i = 0; i <= 3; i++) {
        volatile uint32_t *thisvic = (volatile void *) (vic + 0x10000 * i);
        thisvic[0x14/4] = 0xffffffff;
        // openiboot does this but I don't think iBoot does - is it correct here?
        thisvic[0x24/4] = 0xffff;
        for(int j = 0; j < 0x20; j++) {
            thisvic[0x100/4 + j] = i*0x20 + j;
        }
    }

    serial_putstring("phase_2\n");

    put(type);
    put(&args_storage);

    // Anyway, at this point we can use the *_final pointers.
    
    flush_cache(pagetable_storage, 0x4000);
    
    uint32_t pagetable_storage_paddr = virt_to_phys(pagetable_storage);
    put(pagetable_storage_paddr);
    asm volatile("mcr p15, 0, %0, c2, c0, 1" ::"r"(pagetable_storage_paddr | 0x18)); // ttbr1
    asm volatile("mcr p15, 0, %0, c7, c10, 4;"
                 "mcr p15, 0, %0, c7, c5, 4" :: "r"(0));
    invalidate_tlb();
    
    serial_putstring("copying segments\n");
    
    uint32_t jump_addr = 0;
    CMD_ITERATE(kern_hdr, cmd) {
        if(cmd->cmd == LC_SEGMENT) {
            struct segment_command *seg = (void *) cmd;
            struct section *sections = (void *) (seg + 1);
            serial_putstring(seg->segname);

            if(seg->filesize > 0) {
                my_memcpy((void *) seg->vmaddr, ((char *) kern_hdr) + seg->fileoff, seg->filesize);
            }
            
            if(seg->vmsize > seg->filesize) {
                my_memset((char *) seg->vmaddr + seg->filesize, 0, seg->vmsize - seg->filesize);
            }
            serial_putstring(" flush");
            
            flush_cache((void *) seg->vmaddr, seg->vmsize);

            serial_putstring(" ok\n");
        } else if(cmd->cmd == LC_UNIXTHREAD) {
            struct {
                uint32_t cmd;
                uint32_t cmdsize;
                uint32_t flavor;
                uint32_t count;
                arm_thread_state_t state;
            } *ut = (void *) cmd;
            serial_putstring("got UNIXTHREAD flavor="); serial_puthex(ut->flavor); serial_putstring("\n");
            if(ut->flavor == ARM_THREAD_STATE) {
                // like iBoot, ignore everything but PC
                jump_addr = (uint32_t) ut->state.__pc;
            }
        }
    }



    serial_putstring("copying 2\n");
    my_memcpy(args_final, &args_storage, sizeof(struct boot_args));
    my_memcpy(pagetable_final, pagetable_storage, 0x4000);

    for(uint32_t i = 0x400; i < 0x5e0; i++) {
        pagetable_final[i] = (i << 20) | 0x40c0e;
    }

    for(uint32_t i = 0x5e0; i < 0x700; i++) {
        pagetable_final[i] = (i << 20) | 0x40c02; // device
    }

    flush_cache(pagetable_final, 0x4000);

    serial_putstring("okay\n");

    args_final->pt_paddr = virt_to_phys(pagetable_final);

    serial_putstring("about to do the mcr, pt_paddr = "); serial_puthex(args_final->pt_paddr); serial_putstring("\n");

    asm volatile("mcr p15, 0, %0, c2, c0, 1" ::"r"(args_final->pt_paddr | 0x18)); // ttbr1
    asm volatile("mcr p15, 0, %0, c7, c10, 4;"
                 "mcr p15, 0, %0, c7, c5, 4" :: "r"(0));
    
    invalidate_tlb();

    serial_putstring("did the mcr\n");

    //kern_hdr = (void *) virt_to_phys(kern_hdr);
    serial_putstring("new "); put(kern_hdr);

    args_final->dt_vaddr = devicetree_final;
    args_final->v_display = 0; // verbose
    
    my_memcpy(devicetree_final, devicetree, devicetree_size);
    devicetree = devicetree_final;

    serial_putstring("total used: "); serial_puthex(placeholders_p - placeholders); serial_putstring("\n");

/*
#if PUTC || HAVE_SERIAL
static const char c[] = " io=4095 serial=15 diag=15 sdio.debug.init-delay=10000 sdio.log.level=65535 sdio.log.flags=1"
# if PUTC
" debug=0xa"
# endif
;
#else
static const char c[] = " io=4095 diag=15";
#endif
*/

    static const char c[] = "-v io=8 " //sdio.log.level=65535 sdio.log.flags=1 "
#if 0
"sdio.debug.init-delay=10000 "
#endif
#if HAVE_SERIAL || PUTC
    "serial=1 "
#endif
#if HAVE_SERIAL && 0
    "debug=0x225 "
#else
    "debug=0x400 "
#endif
    ;

    my_memcpy(args_final->cmdline, c, sizeof(c));

#if DEBUG
    // Note that for now it is necessary to ensure that the affected instruction range does not use PC, and ends on an instruction boundary. Annoying, but...
    /*place_annoyance(SCRATCH + 0x1000, 0x80790f45, 8);
place_annoyance(SCRATCH + 0x1100, 0x80791001, 8);
place_annoyance(SCRATCH + 0x1200, 0x80791047, 10);
place_annoyance(SCRATCH + 0x1300, 0x807910a1, 8);
place_annoyance(SCRATCH + 0x1400, 0x807911cd, 10);
place_annoyance(SCRATCH + 0x1500, 0x80791255, 10);
place_annoyance(SCRATCH + 0x1600, 0x80791267, 10);
place_annoyance(SCRATCH + 0x1700, 0x8079128d, 8);
place_annoyance(SCRATCH + 0x1800, 0x807912c5, 8);
place_annoyance(SCRATCH + 0x1900, 0x80791319, 8);
place_annoyance(SCRATCH + 0x1a00, 0x807913bf, 10);
place_annoyance(SCRATCH + 0x1b00, 0x807913d9, 8);
place_annoyance(SCRATCH + 0x1c00, 0x80791401, 8);
place_annoyance(SCRATCH + 0x1d00, 0x80791429, 8);*/
    //place_annoyance(SCRATCH + 0x1e00, 0x80791447, 12);
    //place_annoyance(SCRATCH + 0x1f00, 0x80791453, 12);
    //place_annoyance(SCRATCH + 0x2000, 0x807914bf, 10);
    //place_annoyance(SCRATCH + 0x2100, 0x807914d1, 8);
    //place_annoyance(SCRATCH + 0x2200, 0x807914f9, 12);
    //place_blxsp(0x80791453);
    //place_blxsp(0x80791481);
    place_blxsp(0x80791499);
    place_blxsp(0x807914cf);
    place_blxsp(0x8079152b);
    place_blxsp(0x807914f9);
#endif

#if PUTC
    place_putc();
#endif
    //place_thing(fffuuu, SCRATCH + 0x10000, 0x80867645);
    
    // "In addition, if the physical address of the code that enables or disables the MMU differs from its MVA, instruction prefetching can cause complications. Therefore, ARM strongly recommends that any code that enables or disables the MMU has identical virtual and physical addresses."

#if DEBUG
    my_memset((void *) args_final->v_baseAddr, 0xff, args_final->v_height * args_final->v_rowBytes);
#endif
    
    my_memcpy((void *) 0x40000000, (void *) (((uint32_t) vita) & ~1), 0x100);
    flush_cache((void *) 0x40000000, 0x100);

    uint32_t jump_phys = virt_to_phys((void *) jump_addr);
    put(jump_phys);
    uint32_t args_phys = virt_to_phys(args_final);
    put(args_phys);

    serial_putstring("boot args: "); serial_putstring(args_final->cmdline); serial_putstring("\n");
    serial_putstring("taking the plunge\n");

#if PUTC
    *((uint32_t *) 0x8000011c) = 0; // don't move this line up
#endif

    ((void (*)(uint32_t, uint32_t)) 0x40000000)(args_phys, jump_phys);

    serial_putstring("it returned?\n");
    return 0;
}

typedef uint32_t user_addr_t;

struct args {
    user_addr_t kern;
    size_t kern_size;
    user_addr_t devicetree;
    size_t devicetree_size;
};

int ok_go(void *p, struct args *uap, int32_t *retval) {
    kern_hdr = IOMallocContiguous(uap->kern_size, 1, NULL);
    pagetable_storage = IOMallocContiguous(0x4000, 0x4000, NULL);
    copyin(uap->kern, kern_hdr, uap->kern_size);
    devicetree = kalloc(uap->devicetree_size);
    devicetree_size = uap->devicetree_size;
    copyin(uap->devicetree, devicetree, uap->devicetree_size);

    flush_cache(kern_hdr, uap->kern_size);
    flush_cache(devicetree, uap->devicetree_size);

    *retval = phase_1();
    if(*retval) {
        IOFreeContiguous(kern_hdr, uap->kern_size);
        IOFreeContiguous(pagetable_storage, 0x4000);
        kfree(devicetree, uap->devicetree_size);
    }
    return 0;
}

struct proc;
typedef int32_t sy_call_t(struct proc *, void *, int *);
typedef void sy_munge_t(const void *, void *);

struct sysent { /* system call table */
    int16_t sy_narg; /* number of args */
    int8_t sy_resv; /* reserved */
    int8_t sy_flags; /* flags */
    sy_call_t *sy_call; /* implementing function */
    sy_munge_t *sy_arg_munge32; /* system call arguments munger for 32-bit process */
    sy_munge_t *sy_arg_munge64; /* system call arguments munger for 64-bit process */
    int32_t sy_return_type; /* system call return types */
    uint16_t sy_arg_bytes; /* Total size of arguments in bytes for
* 32-bit system calls
*/
};
#define _SYSCALL_RET_INT_T 1


extern struct sysent sysent[];

__attribute__((constructor))
static void init() {
    sysent[8] = (struct sysent){ 1, 0, 0, (void *) ok_go, NULL, NULL, _SYSCALL_RET_INT_T, sizeof(struct args) };
}


Something went wrong with that request. Please try again.