christoph/lecture-operating-system-development
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initialize cga cursor to 0

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This commit is contained in:
churl
2022-04-24 13:09:28 +02:00
parent 199b68ca3e
commit f44e7d3956
2 changed files with 4 additions and 1 deletions
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3
c_os/devices/CGA.cc
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@ -162,10 +162,13 @@ void CGA::scrollup () {
void CGA::clear () { void CGA::clear () {
/* Hier muess Code eingefuegt werden */ /* Hier muess Code eingefuegt werden */
for (unsigned short byte = 2 * 80 * 0; byte < 2 * 80 * 25; ++byte) { for (unsigned short byte = 2 * 80 * 0; byte < 2 * 80 * 25; ++byte) {
*((char*)(CGA_START + byte)) = '\0'; *((char*)(CGA_START + byte)) = '\0';
} }
this->setpos(0, 0);
} }

2
c_os/devices/CGA.h
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@ -32,7 +32,7 @@ public:
CGA () : index_port (0x3d4), data_port (0x3d5) { CGA () : index_port (0x3d4), data_port (0x3d5) {
CGA_START = (const char*)0xb8000; CGA_START = (const char*)0xb8000;
// NOTE: Added this // NOTE: I added this
this->setpos(0, 0); this->setpos(0, 0);
} }