karina
502413b9ab
- Add IOSerial: PL011 (0x0900_0000) TX with FIFO-full polling, yield while waiting - Add Arch/IO.h (32-bit MMIO with DSB) and Arch/CPU.h (yield, WFI) - Extend types.h (e.g. ASCII, Address, Int/UInt aliases) - Wire KernelMain to IOSerialPutString for early boot output - Drop .sourcekit-lsp config; note IO glob in CMake (commented)
25 lines
562 B
C
25 lines
562 B
C
#include <IO/IOSerial.h>
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#include <Arch/IO.h>
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#include <Arch/CPU.h>
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Int32 IOSerialPutCharacter(ASCII character) {
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// TXFF -- TRansmit FIFO Full for PL011 is 5 bit of FR reg (0x18)
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UInt64 uartFR = kUARTBaseAddress + 0x18;
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while ((IOAddressRead32(uartFR) & (1 << 5)) != 0) {
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CPUYield();
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}
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IOAddressWrite32(kUARTBaseAddress, character);
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return character;
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}
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Int32 IOSerialPutString(const ASCII* string) {
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Int i = 0;
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while (string[i] != '\0') {
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IOSerialPutCharacter(string[i]);
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i++;
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}
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return i;
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} |