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New handling of pmode related functions

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Preperations for taskswitching/v86 mode


Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1152
This commit is contained in:
Sjoerd van der Berg 2003-07-26 10:33:37 +00:00
parent 4a07f3e97b
commit bafbf29f94
1 changed files with 50 additions and 13 deletions
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63
include/cpu.h
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@ -30,13 +30,20 @@ extern Bits CPU_CycleMax;
/* Some common Defines */
/* A CPU Handler */
typedef Bitu (CPU_Decoder)(void);
typedef Bits (CPU_Decoder)(void);
extern CPU_Decoder * cpudecoder;
//CPU Stuff
void SetCPU16bit( );
enum CODE_TYPE {
CODE_REAL,
CODE_PMODE16,
CODE_PMODE32,
CODE_INIT,
};
extern bool parity_lookup[256];
void CPU_LLDT(Bitu selector);
@ -69,7 +76,7 @@ bool CPU_RET(bool use32,Bitu bytes);
bool Interrupt(Bitu num);
bool CPU_IRET(bool use32);
bool CPU_SetSegGeneral(SegNames seg,Bitu value);
void CPU_SetSegGeneral(SegNames seg,Bitu value);
void CPU_CPUID(void);
void CPU_HLT(void);
@ -193,6 +200,33 @@ struct G_Descriptor {
#pragma pack()
struct TaskSegment_32 {
Bit32u esp0; /* The CK stack pointer */
Bit32u esp1; /* The parent KL stack pointer */
Bit32u esp2; /* Unused */
Bit32u cr3; /* The page directory pointer */
Bit32u eip; /* The instruction pointer */
Bit32u eflags; /* The flags */
Bit32u eax, ecx, edx, ebx; /* The general purpose registers */
Bit32u esp, ebp, esi, edi; /* The special purpose registers */
Bit16u back; /* Backlink */
Bit16u ss0; /* The CK stack selector */
Bit16u ss1; /* The parent KL stack selector */
Bit16u ss2; /* Unused */
Bit16u es; /* The extra selector */
Bit16u cs; /* The code selector */
Bit16u ss; /* The application stack selector */
Bit16u ds; /* The data selector */
Bit16u fs; /* And another extra selector */
Bit16u gs; /* ... and another one */
Bit16u ldt; /* The local descriptor table */
Bit16u trap; /* The trap flag (for debugging) */
Bit16u io; /* The I/O Map base address */
};
void CPU_ReadTaskSeg32(PhysPt base,TaskSegment_32 * seg);
class TaskStateSegment
{
public:
@ -212,8 +246,7 @@ private:
Bitu seg_limit;
Bitu seg_value;
};
class Descriptor
{
public:
@ -314,22 +347,26 @@ private:
Bitu ldt_value;
};
#define STATE_PROTECTED 0x0001
#define STATE_USE32 0x0002
#define STATE_STACK32 0x0004
struct CPUBlock {
Bitu cpl; /* Current Privilege */
Bitu state;
Bitu cr0;
bool v86; /* Are we in a v86 task */
bool pmode; /* Is Protected mode enabled */
GDTDescriptorTable gdt;
DescriptorTable idt;
struct {
Bitu prefix,entry;
} full;
Bit16u val;
PhysPt base;
Bitu type;
} tr;
struct {
Bitu eip,cs;
} hlt;
Bitu mask;
bool big;
} stack;
struct {
CODE_TYPE type; /* What kind of code are we running */
bool big;
} code;
};
extern CPUBlock cpu;