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use enum

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This commit is contained in:
Eggert Jung
2025-04-17 21:13:10 +02:00
parent 5a2e32aaeb
commit 798103454e
3 changed files with 30 additions and 8 deletions
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15
arch/cga.cc
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@@ -1,10 +1,21 @@
#include "cga.h" #include "cga.h"
#include "arch/ioport.h"
namespace CGA { namespace CGA {
IOPort index_port = IOPort(0x3d4);
IOPort data_port = IOPort(0x3d5);
void writeCGAReg(int reg, int data){
index_port.outb(reg);
data_port.outb(data);
}
void setCursor(unsigned abs_x, unsigned abs_y) { void setCursor(unsigned abs_x, unsigned abs_y) {
(void)abs_x; uint16_t pos = abs_y * COLUMNS + abs_x;
(void)abs_y;
writeCGAReg(RegisterIndex::CURSOR_LOW, pos & 0xFF);
writeCGAReg(RegisterIndex::CURSOR_HIGH, ((pos >> 8) & 0xFF));
} }
void getCursor(unsigned& abs_x, unsigned& abs_y) { void getCursor(unsigned& abs_x, unsigned& abs_y) {

19
arch/cga.h
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@@ -18,6 +18,15 @@ namespace CGA {
constexpr unsigned ROWS = 25; ///< Visible rows in text mode constexpr unsigned ROWS = 25; ///< Visible rows in text mode
constexpr unsigned COLUMNS = 80; ///< Visible columns in text mode constexpr unsigned COLUMNS = 80; ///< Visible columns in text mode
enum RegisterIndex {
CURSOR_START = 10,
CURSOR_END = 11,
START_ADDRESS_HIGH = 12,
START_ADDRESS_LOW = 13,
CURSOR_HIGH = 14,
CURSOR_LOW = 15
};
/*! \brief CGA color palette /*! \brief CGA color palette
* *
* Colors for the attribute byte. * Colors for the attribute byte.
@@ -62,7 +71,9 @@ enum Color {
*/ */
union Attribute { union Attribute {
struct { struct {
uint8_t todo : 8; uint8_t foreground : 4;
uint8_t background : 3;
uint8_t blink : 1;
} __attribute__((packed)); } __attribute__((packed));
uint8_t value; ///< combined value uint8_t value; ///< combined value
@@ -75,11 +86,7 @@ union Attribute {
* \param blink Blink if `true` (default: no blinking) * \param blink Blink if `true` (default: no blinking)
*/ */
explicit Attribute(Color foreground = LIGHT_GREY, Color background = BLACK, explicit Attribute(Color foreground = LIGHT_GREY, Color background = BLACK,
bool blink = false) { // NOLINT bool blink = false) : foreground(foreground), background(background), blink(blink) {}
(void)foreground;
(void)background;
(void)blink;
}
} __attribute__((packed)); // prevent padding by the compiler } __attribute__((packed)); // prevent padding by the compiler
/*! \brief Set the keyboard hardware cursor to absolute screen position /*! \brief Set the keyboard hardware cursor to absolute screen position

4
main.cc
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@@ -3,12 +3,16 @@
#include "boot/startup_ap.h" #include "boot/startup_ap.h"
#include "debug/output.h" #include "debug/output.h"
#include "arch/cga.h"
// Main function // Main function
// (the bootstrap processor starts here)} // (the bootstrap processor starts here)}
extern "C" int main() { extern "C" int main() {
unsigned int numCPUs = Core::count(); unsigned int numCPUs = Core::count();
DBG_VERBOSE << "Number of CPUs: " << numCPUs << endl; DBG_VERBOSE << "Number of CPUs: " << numCPUs << endl;
CGA::setCursor(1, 2);
/* Start application processors /* Start application processors
* To avoid unexpected behaviour, make sure that interrupts are not * To avoid unexpected behaviour, make sure that interrupts are not
* enabled before the APs are booted. Otherwise it might interfere with the * enabled before the APs are booted. Otherwise it might interfere with the