.TH "kernel/cpu/i386/gdt.c" 9 "Sun Jul 26 2020" "MyOS Kernel" \" -*- nroff -*-
.ad l
.nh
.SH NAME
kernel/cpu/i386/gdt.c
.SH SYNOPSIS
.br
.PP
\fC#include <stdint\&.h>\fP
.br
\fC#include <string\&.h>\fP
.br

.SS "Data Structures"

.in +1c
.ti -1c
.RI "struct \fBgdt_entry\fP"
.br
.ti -1c
.RI "struct \fBgdt_description\fP"
.br
.ti -1c
.RI "struct \fBtss_entry\fP"
.br
.in -1c
.SS "Macros"

.in +1c
.ti -1c
.RI "#define \fBNUM_ENTRIES\fP   6"
.br
.RI "Number of entries in the GDT\&. "
.in -1c
.SS "Functions"

.in +1c
.ti -1c
.RI "static void \fBset_entry\fP (int i, uint32_t base, uint32_t limit, uint8_t access)"
.br
.ti -1c
.RI "static void \fBwrite_tss\fP (int32_t num, uint16_t ss0, uint32_t esp0)"
.br
.ti -1c
.RI "void \fBallow_all_ports\fP ()"
.br
.ti -1c
.RI "void \fBblock_all_ports\fP ()"
.br
.ti -1c
.RI "void \fBgdt_init\fP ()"
.br
.in -1c
.SS "Variables"

.in +1c
.ti -1c
.RI "uint32_t \fBint_stack_top\fP"
.br
.RI "Initial kernel stack before the kernel's first yield\&. "
.ti -1c
.RI "static \fBgdt_entry\fP \fBgdt\fP [\fBNUM_ENTRIES\fP]"
.br
.RI "The GDT\&. "
.ti -1c
.RI "static \fBgdt_description\fP \fBgdt_desc\fP"
.br
.RI "The value to load into the GDTR\&. "
.ti -1c
.RI "\fBtss_entry\fP \fBtss\fP"
.br
.RI "The TSS\&. "
.in -1c
.SH "Function Documentation"
.PP 
.SS "void allow_all_ports ()"
Allows all ports in the IOPB\&. 
.SS "void block_all_ports ()"
Blocks all ports in the IOPB\&. 
.SS "void gdt_init ()"
Initializes the GDT & TSS\&. 
.SS "static void set_entry (int i, uint32_t base, uint32_t limit, uint8_t access)\fC [static]\fP"
Set a GDT entry\&. 
.PP
\fBParameters\fP
.RS 4
\fIi\fP The GDT entry to set\&. 
.br
\fIbase\fP The base of the GDT entry\&. 
.br
\fIlimit\fP The limit of the GDT entry\&. 
.br
\fIaccess\fP The access byte of the GDT entry\&. 
.RE
.PP

.SS "static void write_tss (int32_t num, uint16_t ss0, uint32_t esp0)\fC [static]\fP"
Set a GDT entry\&. 
.PP
\fBParameters\fP
.RS 4
\fInum\fP The GDT entry to set\&. 
.br
\fIss0\fP The kernel stack selector\&. 
.br
\fIesp0\fP The kernel stack pointer\&. 
.RE
.PP

.SH "Author"
.PP 
Generated automatically by Doxygen for MyOS Kernel from the source code\&.