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> #include "arch/x86/intregs.hh"
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> #include "cpu/thread_context.hh"
81c83,208
< //Build the real mode data structure.
---
>
> // The location of the real mode data structure.
> const Addr realModeData = 0x90200;
>
> // A port to write to memory.
> FunctionalPort * physPort = threadContexts[0]->getPhysPort();
>
> /*
> * Deal with the command line stuff.
> */
>
> // A buffer to store the command line.
> const Addr commandLineBuff = 0x90000;
> // A pointer to the commandLineBuff stored in the real mode data.
> const Addr commandLinePointer = realModeData + 0x228;
>
> if (commandLine.length() + 1 > realModeData - commandLineBuff)
> panic("Command line \"%s\" is longer than %d characters.\n",
> commandLine, realModeData - commandLineBuff - 1);
> physPort->writeBlob(commandLineBuff,
> (uint8_t *)commandLine.c_str(), commandLine.length() + 1);
>
> // Generate a pointer of the right size and endianness to put into
> // commandLinePointer.
> uint32_t guestCommandLineBuff =
> X86ISA::htog((uint32_t)commandLineBuff);
> physPort->writeBlob(commandLinePointer,
> (uint8_t *)&guestCommandLineBuff, sizeof(guestCommandLineBuff));
>
> /*
> * Screen Info.
> */
>
> // We'll skip on this for now because it's only needed for framebuffers,
> // something we don't support at the moment.
>
> /*
> * EDID info
> */
>
> // Skipping for now.
>
> /*
> * Saved video mode
> */
>
> // Skipping for now.
>
> /*
> * Loader type.
> */
>
> // Skipping for now.
>
> /*
> * E820 memory map
> */
>
> // A pointer to the number of E820 entries there are.
> const Addr e820MapNrPointer = realModeData + 0x1e8;
>
> // A pointer to the buffer for E820 entries.
> const Addr e820MapPointer = realModeData + 0x2d0;
>
> struct e820Entry
> {
> Addr addr;
> Addr size;
> uint32_t type;
> };
>
> // The size is computed this way to ensure no padding sneaks in.
> int e820EntrySize =
> sizeof(e820Entry().addr) +
> sizeof(e820Entry().size) +
> sizeof(e820Entry().type);
>
> // I'm not sure what these should actually be. On a real machine they
> // would be generated by the BIOS, and they need to reflect the regions
> // which are actually available/reserved. These values are copied from
> // my development machine.
> e820Entry e820Map[] = {
> {ULL(0x0), ULL(0x9d400), 1},
> {ULL(0x9d400), ULL(0xa0000) - ULL(0x9d400), 2},
> {ULL(0xe8000), ULL(0x100000) - ULL(0xe8000), 2},
> {ULL(0x100000), ULL(0xcfff9300) - ULL(0x100000), 1},
> {ULL(0xcfff9300), ULL(0xd0000000) - ULL(0xcfff9300), 2},
> {ULL(0xfec00000), ULL(0x100000000) - ULL(0xfec00000), 2}
> };
>
> uint8_t e820Nr = sizeof(e820Map) / sizeof(e820Entry);
>
> // Make sure the number of entries isn't bigger than what the kernel
> // would be capable of providing.
> assert(e820Nr <= 128);
>
> uint8_t guestE820Nr = X86ISA::htog(e820Nr);
> physPort->writeBlob(e820MapNrPointer,
> (uint8_t *)&guestE820Nr, sizeof(guestE820Nr));
>
> for (int i = 0; i < e820Nr; i++) {
> e820Entry guestE820Entry;
> guestE820Entry.addr = X86ISA::htog(e820Map[i].addr);
> guestE820Entry.size = X86ISA::htog(e820Map[i].size);
> guestE820Entry.type = X86ISA::htog(e820Map[i].type);
> physPort->writeBlob(e820MapPointer + e820EntrySize * i,
> (uint8_t *)&guestE820Entry.addr,
> sizeof(guestE820Entry.addr));
> physPort->writeBlob(
> e820MapPointer + e820EntrySize * i +
> sizeof(guestE820Entry.addr),
> (uint8_t *)&guestE820Entry.size,
> sizeof(guestE820Entry.size));
> physPort->writeBlob(
> e820MapPointer + e820EntrySize * i +
> sizeof(guestE820Entry.addr) +
> sizeof(guestE820Entry.size),
> (uint8_t *)&guestE820Entry.type,
> sizeof(guestE820Entry.type));
> }
>
> /*
> * Pass the location of the real mode data structure to the kernel
> * using register %esi. We'll use %rsi which should be equivalent.
> */
> threadContexts[0]->setIntReg(INTREG_RSI, realModeData);