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Add MMIO read/write functions.

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This commit is contained in:
Curle 2020-08-31 21:51:07 +01:00
parent 2e662e3717
commit 9c65d7d19f
Signed by: TheCurle
GPG Key ID: 5942F13718443F79
2 changed files with 36 additions and 0 deletions
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8
chroma/inc/kernel/system/io.h
View File

@ -5,6 +5,8 @@
*** Chroma ***
***********************/
#define PAUSE __asm__ __volatile__("pause")
uint8_t kbdSBuffer[8];
uint8_t InputBuffer[128];
@ -37,6 +39,10 @@ void WriteTSR(uint16_t TSRData);
uint32_t ReadPort(uint16_t Port, int Length);
uint32_t WritePort(uint16_t Port, uint32_t Data, int Length);
size_t ReadMMIO(size_t Address, int Length);
void WriteMMIO(size_t Address, size_t Data, int Length);
size_t ReadModelSpecificRegister(size_t MSR);
size_t WriteModelSpecificRegister(size_t MSR, size_t Data);
@ -52,6 +58,8 @@ size_t WriteControlRegister(int CRX, size_t Data);
size_t ReadExtendedControlRegister(size_t XCRX);
size_t WriteExtendedControlRegister(size_t XCRX, size_t Data);
void InvalidatePage(size_t Page);
// XCS = Extended Code Segment
size_t ReadXCS(void);

28
chroma/system/rw.c
View File

@ -7,6 +7,9 @@
/* This file serves to allow us to communicate with the computer through raw I/O.
* It provides interfaces for Ports and commonly used Registers (Control Registers, Model-Specific Registers, GDT, IDT..)
*
* Additionally, there are wrapper functions for MMIO accesses.
*
*/
uint32_t ReadPort(uint16_t Port, int Length) {
@ -41,6 +44,31 @@ uint32_t WritePort(uint16_t Port, uint32_t Data, int Length) {
return Data;
}
size_t ReadMMIO(size_t Address, int Length) {
if (Length == 1) {
return *((volatile uint8_t*)(Address));
} else if (Length == 2) {
return *((volatile uint16_t*)(Address));
} else if (Length == 4) {
return *((volatile uint32_t*)(Address));
} else {
return *((volatile size_t*)(Address));
}
}
void WriteMMIO(size_t Address, size_t Data, int Length) {
if(Length == 1) {
(*((volatile uint8_t*)(Address))) = ((uint8_t) Data);
} else if (Length == 2) {
(*((volatile uint16_t*)(Address))) = ((uint16_t) Data);
} else if (Length == 4) {
(*((volatile uint32_t*)(Address))) = ((uint32_t) Data);
} else {
(*((volatile uint8_t*)(Address))) = (Data);
}
}
size_t ReadModelSpecificRegister(size_t MSR) {
size_t RegHigh = 0, RegLow = 0;