我得到59行這樣的警告:在收到警告「賦值時將指針整數,未作類型轉換」
賦值時將指針整數,未作演員。
我該如何解決?這裏是(從http://pastebin.com/BrmjBAS0複製)整個文件:
/* bkerndev - Bran's Kernel Development Tutorial
* By: Brandon F. ([email protected])
* Desc: Global Descriptor Table management
*
* Notes: No warranty expressed or implied. Use at own risk. */
/* Defines a GDT entry */
struct gdt_entry
{
unsigned short limit_low;
unsigned short base_low;
unsigned char base_middle;
unsigned char access;
unsigned char granularity;
unsigned char base_high;
} __attribute__((packed));
struct gdt_ptr
{
unsigned short limit;
unsigned int base;
} __attribute__((packed));
/* Our GDT, with 3 entries, and finally our special GDT pointer */
struct gdt_entry gdt[3];
struct gdt_ptr gp;
/* This is in start.asm. We use this to properly reload
* the new segment registers */
extern void _gdt_flush();
/* Setup a descriptor in the Global Descriptor Table */
void gdt_set_gate(int num, unsigned long base, unsigned long limit, unsigned char access, unsigned char gran)
{
/* Setup the descriptor base address */
gdt[num].base_low = (base & 0xFFFF);
gdt[num].base_middle = (base >> 16) & 0xFF;
gdt[num].base_high = (base >> 24) & 0xFF;
/* Setup the descriptor limits */
gdt[num].limit_low = (limit & 0xFFFF);
gdt[num].granularity = ((limit >> 16) & 0x0F);
/* Finally, set up the granularity and access flags */
gdt[num].granularity |= (gran & 0xF0);
gdt[num].access = access;
}
/* Should be called by main. This will setup the special GDT
* pointer, set up the first 3 entries in our GDT, and then
* finally call gdt_flush() in our assembler file in order
* to tell the processor where the new GDT is and update the
* new segment registers */
void gdt_install()
{
/* Setup the GDT pointer and limit */
gp.limit = (sizeof(struct gdt_entry) * 3) - 1;
gp.base = &gdt;
/* Our NULL descriptor */
gdt_set_gate(0, 0, 0, 0, 0);
/* The second entry is our Code Segment. The base address
* is 0, the limit is 4GBytes, it uses 4KByte granularity,
* uses 32-bit opcodes, and is a Code Segment descriptor.
* Please check the table above in the tutorial in order
* to see exactly what each value means */
gdt_set_gate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF);
/* The third entry is our Data Segment. It's EXACTLY the
* same as our code segment, but the descriptor type in
* this entry's access byte says it's a Data Segment */
gdt_set_gate(2, 0, 0xFFFFFFFF, 0x92, 0xCF);
/* Flush out the old GDT and install the new changes! */
_gdt_flush();
}
請給我一個線索......代碼的哪一行? – Andrew
對不起,我忘了寫!這是59,「gp.base = &gdt;」! –