X86: Start setting up the real mode data structure.
--HG-- extra : convert_revision : ba6d4939d4d58da5586655c83f1617f47dc7e359
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1 changed files with 128 additions and 1 deletions
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@ -55,9 +55,11 @@
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* Authors: Gabe Black
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* Authors: Gabe Black
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*/
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*/
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#include "arch/x86/intregs.hh"
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#include "arch/x86/linux/system.hh"
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#include "arch/x86/linux/system.hh"
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#include "arch/vtophys.hh"
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#include "arch/vtophys.hh"
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#include "base/trace.hh"
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#include "base/trace.hh"
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#include "cpu/thread_context.hh"
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#include "mem/physical.hh"
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#include "mem/physical.hh"
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#include "params/LinuxX86System.hh"
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#include "params/LinuxX86System.hh"
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@ -78,7 +80,132 @@ void
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LinuxX86System::startup()
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LinuxX86System::startup()
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{
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{
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X86System::startup();
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X86System::startup();
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//Build the real mode data structure.
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// The location of the real mode data structure.
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const Addr realModeData = 0x90200;
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// A port to write to memory.
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FunctionalPort * physPort = threadContexts[0]->getPhysPort();
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/*
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* Deal with the command line stuff.
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*/
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// A buffer to store the command line.
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const Addr commandLineBuff = 0x90000;
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// A pointer to the commandLineBuff stored in the real mode data.
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const Addr commandLinePointer = realModeData + 0x228;
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if (commandLine.length() + 1 > realModeData - commandLineBuff)
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panic("Command line \"%s\" is longer than %d characters.\n",
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commandLine, realModeData - commandLineBuff - 1);
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physPort->writeBlob(commandLineBuff,
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(uint8_t *)commandLine.c_str(), commandLine.length() + 1);
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// Generate a pointer of the right size and endianness to put into
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// commandLinePointer.
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uint32_t guestCommandLineBuff =
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X86ISA::htog((uint32_t)commandLineBuff);
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physPort->writeBlob(commandLinePointer,
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(uint8_t *)&guestCommandLineBuff, sizeof(guestCommandLineBuff));
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/*
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* Screen Info.
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*/
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// We'll skip on this for now because it's only needed for framebuffers,
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// something we don't support at the moment.
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/*
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* EDID info
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*/
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// Skipping for now.
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/*
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* Saved video mode
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*/
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// Skipping for now.
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/*
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* Loader type.
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*/
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// Skipping for now.
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/*
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* E820 memory map
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*/
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// A pointer to the number of E820 entries there are.
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const Addr e820MapNrPointer = realModeData + 0x1e8;
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// A pointer to the buffer for E820 entries.
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const Addr e820MapPointer = realModeData + 0x2d0;
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struct e820Entry
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{
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Addr addr;
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Addr size;
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uint32_t type;
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};
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// The size is computed this way to ensure no padding sneaks in.
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int e820EntrySize =
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sizeof(e820Entry().addr) +
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sizeof(e820Entry().size) +
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sizeof(e820Entry().type);
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// I'm not sure what these should actually be. On a real machine they
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// would be generated by the BIOS, and they need to reflect the regions
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// which are actually available/reserved. These values are copied from
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// my development machine.
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e820Entry e820Map[] = {
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{ULL(0x0), ULL(0x9d400), 1},
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{ULL(0x9d400), ULL(0xa0000) - ULL(0x9d400), 2},
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{ULL(0xe8000), ULL(0x100000) - ULL(0xe8000), 2},
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{ULL(0x100000), ULL(0xcfff9300) - ULL(0x100000), 1},
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{ULL(0xcfff9300), ULL(0xd0000000) - ULL(0xcfff9300), 2},
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{ULL(0xfec00000), ULL(0x100000000) - ULL(0xfec00000), 2}
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};
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uint8_t e820Nr = sizeof(e820Map) / sizeof(e820Entry);
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// Make sure the number of entries isn't bigger than what the kernel
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// would be capable of providing.
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assert(e820Nr <= 128);
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uint8_t guestE820Nr = X86ISA::htog(e820Nr);
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physPort->writeBlob(e820MapNrPointer,
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(uint8_t *)&guestE820Nr, sizeof(guestE820Nr));
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for (int i = 0; i < e820Nr; i++) {
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e820Entry guestE820Entry;
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guestE820Entry.addr = X86ISA::htog(e820Map[i].addr);
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guestE820Entry.size = X86ISA::htog(e820Map[i].size);
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guestE820Entry.type = X86ISA::htog(e820Map[i].type);
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physPort->writeBlob(e820MapPointer + e820EntrySize * i,
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(uint8_t *)&guestE820Entry.addr,
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sizeof(guestE820Entry.addr));
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physPort->writeBlob(
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e820MapPointer + e820EntrySize * i +
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sizeof(guestE820Entry.addr),
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(uint8_t *)&guestE820Entry.size,
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sizeof(guestE820Entry.size));
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physPort->writeBlob(
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e820MapPointer + e820EntrySize * i +
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sizeof(guestE820Entry.addr) +
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sizeof(guestE820Entry.size),
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(uint8_t *)&guestE820Entry.type,
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sizeof(guestE820Entry.type));
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}
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/*
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* Pass the location of the real mode data structure to the kernel
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* using register %esi. We'll use %rsi which should be equivalent.
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*/
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threadContexts[0]->setIntReg(INTREG_RSI, realModeData);
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}
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}
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LinuxX86System *
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LinuxX86System *
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