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Rev 315 | Rev 413 | ||
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Line 39... | Line 39... | ||
39 | * Change CPU protection level to 3, enter userspace. |
39 | * Change CPU protection level to 3, enter userspace. |
40 | * |
40 | * |
41 | */ |
41 | */ |
42 | void userspace(void) |
42 | void userspace(void) |
43 | { |
43 | { |
44 | pri_t pri; |
44 | ipl_t ipl; |
45 | 45 | ||
46 | pri = cpu_priority_high(); |
46 | ipl = interrupts_disable(); |
47 | 47 | ||
48 | __asm__ volatile ( |
48 | __asm__ volatile ( |
49 | /* CLNT */ |
49 | /* CLNT */ |
50 | "pushfl;" |
50 | "pushfl;" |
51 | "pop %%eax;" |
51 | "pop %%eax;" |
Line 58... | Line 58... | ||
58 | "pushl %2\n" |
58 | "pushl %2\n" |
59 | "pushl %3\n" |
59 | "pushl %3\n" |
60 | "pushl %4\n" |
60 | "pushl %4\n" |
61 | "iret" |
61 | "iret" |
62 | : |
62 | : |
63 | : "i" (selector(UDATA_DES) | PL_USER), "r" (USTACK_ADDRESS+(THREAD_STACK_SIZE)), "r" (pri), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS) |
63 | : "i" (selector(UDATA_DES) | PL_USER), "r" (USTACK_ADDRESS+(THREAD_STACK_SIZE)), "r" (ipl), "i" (selector(UTEXT_DES) | PL_USER), "i" (UTEXT_ADDRESS) |
64 | : "eax"); |
64 | : "eax"); |
65 | 65 | ||
66 | /* Unreachable */ |
66 | /* Unreachable */ |
67 | for(;;); |
67 | for(;;); |
68 | } |
68 | } |