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base repository: dreamportdev/Osdev-Notes
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  • 3 commits
  • 3 files changed
  • 3 contributors

Commits on Feb 12, 2025

  1. Update I_Acknowledgments.md for new username (#111)

    @IAmTheNerdNextDoor
    IAmTheNerdNextDoor authored Feb 12, 2025
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Commits on Feb 23, 2025

  1. improve formatting of systemcalls chapter

    @dreamos82
    dreamos82 committed Feb 23, 2025
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Commits on Mar 6, 2025

  1. osdev: userspace: switching modes fix wrong order (#112)

    @vasilisalmpanis
    vasilisalmpanis authored Mar 6, 2025
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Showing with 6 additions and 5 deletions.
  1. +2 −2 06_Userspace/02_Switching_Modes.md
  2. +2 −2 06_Userspace/04_System_Calls.md
  3. +2 −1 99_Appendices/I_Acknowledgments.md
4 changes: 2 additions & 2 deletions 06_Userspace/02_Switching_Modes.md
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Original file line number Diff line number Diff line change
@@ -35,8 +35,8 @@ So if we're going to ring 0 (supervisor), RPL can be left at 0. If going to ring
This means our selectors for `ss` and `cs` end up looking like this:

```c
kernel_ss = 0x08 | 0;
kernel_cs = 0x10 | 0;
kernel_cs = 0x08 | 0;
kernel_ss = 0x10 | 0;
user_cs = 0x18 | 3;
user_ss = 0x20 | 3;
```
4 changes: 2 additions & 2 deletions 06_Userspace/04_System_Calls.md
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Original file line number Diff line number Diff line change
@@ -135,7 +135,7 @@ First things first, the `syscall`/`sysret` pair uses three MSRs: `STAR` (0xC0000
An example of properly configured GDT and MSRs for 64-bit-only operation:
GDT:
* GDT:
|Offset|Name|Access byte|
|------|----|-----------|
|0x0|NULL|`0`|
@@ -144,7 +144,7 @@ GDT:
|0x18|User Data|`0b11110010`|
|0x20|User Code|`0b11111010`|
MSRs:
* MSRs:
|MSR|Name|Value|
|---|----|-----|
|`0xC0000081`|`STAR`| `0x0013000800000000` |
3 changes: 2 additions & 1 deletion 99_Appendices/I_Acknowledgments.md
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Original file line number Diff line number Diff line change
@@ -22,4 +22,5 @@ In no particular order:
- @Hqnnqh ([https://github.com/Hqnnqh](https://github.com/Hqnnqh))
- @malletgaetan ([https://github.com/malletgaetan](https://github.com/malletgaetan))
- @mrjbom ([https://github.com/mrjbom](https://github.com/mrjbom))
- @AFellowSpeedrunner ([https://github.com/AFellowSpeedrunner](https://github.com/AFellowSpeedrunner))
- @IAmTheNerdNextDoor ([https://github.com/IAmTheNerdNextDoor](https://github.com/IAmTheNerdNextDoor))
- @vasilisalmpanis ([https://github.com/vasilisalmpanis](https://github.com/vasilisalmpanis))