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authorGabe Black <gblack@eecs.umich.edu>2007-12-02 00:04:31 -0800
committerGabe Black <gblack@eecs.umich.edu>2007-12-02 00:04:31 -0800
commit82e705d713e3aa546002adad3c5349513d439114 (patch)
treec3ce45e6890f20b59d2f4325232333e7ab45cf68
parent5de71e39d87179102c1b6fbde5df1b703188bcf1 (diff)
downloadgem5-82e705d713e3aa546002adad3c5349513d439114.tar.xz
X86: Start setting up the real mode data structure.
--HG-- extra : convert_revision : ba6d4939d4d58da5586655c83f1617f47dc7e359
-rw-r--r--src/arch/x86/linux/system.cc129
1 files changed, 128 insertions, 1 deletions
diff --git a/src/arch/x86/linux/system.cc b/src/arch/x86/linux/system.cc
index 0633ccb7a..2569fb0ae 100644
--- a/src/arch/x86/linux/system.cc
+++ b/src/arch/x86/linux/system.cc
@@ -55,9 +55,11 @@
* Authors: Gabe Black
*/
+#include "arch/x86/intregs.hh"
#include "arch/x86/linux/system.hh"
#include "arch/vtophys.hh"
#include "base/trace.hh"
+#include "cpu/thread_context.hh"
#include "mem/physical.hh"
#include "params/LinuxX86System.hh"
@@ -78,7 +80,132 @@ void
LinuxX86System::startup()
{
X86System::startup();
- //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);
}
LinuxX86System *