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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! `x86_64` flags and bitfields.</span>
<span class="comment">/* Rflags Register */</span>
<span class="doccomment">/// Carry flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_CF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">0</span>;
<span class="doccomment">/// Parity flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_PF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">2</span>;
<span class="doccomment">/// Adjust flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_AF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">4</span>;
<span class="doccomment">/// Zero flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_ZF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">6</span>;
<span class="doccomment">/// Sign flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_SF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">7</span>;
<span class="doccomment">/// Sign flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_IF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">9</span>;
<span class="doccomment">/// Direction flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_DF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">10</span>;
<span class="doccomment">/// Overflow flag.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_OF</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">11</span>;
<span class="doccomment">/// I/O privilege level.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_IOPL</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0b11</span> <span class="op"><</span><span class="op"><</span> <span class="number">12</span>;
<span class="doccomment">/// Alignment check.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">RFLAGS_AC</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">18</span>;
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_cf</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_CF</span>) <span class="op">></span><span class="op">></span> <span class="number">0</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_pf</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_PF</span>) <span class="op">></span><span class="op">></span> <span class="number">2</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_af</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_AF</span>) <span class="op">></span><span class="op">></span> <span class="number">4</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_zf</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_ZF</span>) <span class="op">></span><span class="op">></span> <span class="number">6</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_sf</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_SF</span>) <span class="op">></span><span class="op">></span> <span class="number">7</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_if</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_IF</span>) <span class="op">></span><span class="op">></span> <span class="number">9</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_df</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_DF</span>) <span class="op">></span><span class="op">></span> <span class="number">10</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_of</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_OF</span>) <span class="op">></span><span class="op">></span> <span class="number">11</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_iopl</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_IOPL</span>) <span class="op">></span><span class="op">></span> <span class="number">12</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">rflags_ac</span>(<span class="ident">r</span>: <span class="ident">u64</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u64</span> { (<span class="ident">r</span> <span class="op">&</span> <span class="ident">RFLAGS_AC</span>) <span class="op">></span><span class="op">></span> <span class="number">18</span> }
<span class="comment">/* Segment Selector */</span>
<span class="doccomment">/// Requested privilege level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Privilege level of the segment selector, where `0` is the most privileged mode and `3` the</span>
<span class="doccomment">/// least.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SEG_SELECTOR_RPL</span> : <span class="ident">u16</span> <span class="op">=</span> <span class="number">0b11</span> <span class="op"><</span><span class="op"><</span> <span class="number">0</span>;
<span class="doccomment">/// Table indicator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// | TI | Table |</span>
<span class="doccomment">/// |----|-------|</span>
<span class="doccomment">/// | 0 | GDT |</span>
<span class="doccomment">/// | 1 | LDT |</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SEG_SELECTOR_TI</span> : <span class="ident">u16</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">2</span>;
<span class="doccomment">/// Table index.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Index into the `GDT` or `LDT` table to select the segment descriptor. `GDT.base + 8 * index`</span>
<span class="doccomment">/// gives the address of the segment descriptor (times `8` because every segment descriptor is `8</span>
<span class="doccomment">/// byte`).</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">SEG_SELECTOR_INDEX</span> : <span class="ident">u16</span> <span class="op">=</span> <span class="number">0x1fff</span> <span class="op"><</span><span class="op"><</span> <span class="number">3</span>;
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">seg_selector_rpl</span>(<span class="ident">s</span> : <span class="ident">u16</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u16</span> { (<span class="ident">s</span> <span class="op">&</span> <span class="ident">SEG_SELECTOR_RPL</span>) <span class="op">></span><span class="op">></span> <span class="number">0</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">seg_selector_ti</span>(<span class="ident">s</span> : <span class="ident">u16</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u16</span> { (<span class="ident">s</span> <span class="op">&</span> <span class="ident">SEG_SELECTOR_TI</span>) <span class="op">></span><span class="op">></span> <span class="number">2</span> }
<span class="kw">pub</span> <span class="kw">const</span> <span class="kw">fn</span> <span class="ident">seg_selector_index</span>(<span class="ident">s</span> : <span class="ident">u16</span>) <span class="op">-</span><span class="op">></span> <span class="ident">u16</span> { (<span class="ident">s</span> <span class="op">&</span> <span class="ident">SEG_SELECTOR_INDEX</span>) <span class="op">></span><span class="op">></span> <span class="number">3</span> }
<span class="comment">/* Control Register CR0 (operation mode & state of the processor) */</span>
<span class="doccomment">/// Protection Enable.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Enables `protected mode` when set and `real-address mode` when cleared. This enables</span>
<span class="doccomment">/// `segment-level protection` not paging.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_PE</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">0</span>;
<span class="doccomment">/// Monitor Coprocessor.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_MP</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">1</span>;
<span class="doccomment">/// Emulation.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When set indicates the process does not have a FPU. FPU instructions will generate an exception</span>
<span class="doccomment">/// that software can emulate the instruction.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_EM</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">2</span>;
<span class="doccomment">/// Task Switched.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_TS</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">3</span>;
<span class="doccomment">/// Extension Type.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_ET</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">4</span>;
<span class="doccomment">/// Numeric Error.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_NE</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">5</span>;
<span class="doccomment">/// Write Protect.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When set supervisor-level procedures can't write to read-only pages.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_WP</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">16</span>;
<span class="doccomment">/// Alignment Mask.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Enables alignment check for `CPL=3`, check is only done if the [AC</span>
<span class="doccomment">/// bit](crate::x86_64::RFLAGS_AC) of the `rflags` register ist set.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_AM</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">18</span>;
<span class="doccomment">/// Not Write-Torugh.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_NW</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">29</span>;
<span class="doccomment">/// Cachine disable.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_CD</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">30</span>;
<span class="doccomment">/// Paging.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Enables paging when set, requires [CR0_PE](crate::x86_64::CR0_PE) to be set as well.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR0_PG</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">31</span>;
<span class="comment">/* Control Register CR3 (paging information)
*
* Holds the physical base address of the first paging structure. The 12 lower bytes of the base
* address are assumed to be 0 and hence the first paging structure must be aligned to a 4K
* boundary.
*/</span>
<span class="doccomment">/// Mask for physical base address of paging structure.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR3_PAGE_BASE_MASK</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0xffff_ffff_ffff_0000</span>;
<span class="doccomment">/// Page-level Write-Through.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR3_PWT</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">3</span>;
<span class="doccomment">/// Page-level Cache Disable.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR3_PCD</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">4</span>;
<span class="comment">/* Control Register CR4 (flags for arch extenstions processor capabilities) */</span>
<span class="doccomment">/// Physical Address Extenstion.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When set enables paging to produce physicall addresses with more than 32 bits. Required before</span>
<span class="doccomment">/// entering `long mode`.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR4_PAE</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">5</span>;
<span class="doccomment">/// 57-bit Linear Addresses.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When set in `long mode` enables `5-level` paging to translate `57-bit` linear addresses. When</span>
<span class="doccomment">/// cleared use `4-level` paging to translate `48-bit` linear addresses.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">CR4_LA57</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">5</span>;
<span class="comment">/* Extended Feature Enable Register (EFER) */</span>
<span class="doccomment">/// Extended Feature Enable Register MSR number.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// MSR number used with the [`rdmsr`][msr] and [`wrmsr`][msr] instructions to read/write the</span>
<span class="doccomment">/// `EFER` model specific register.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [msr]: https://johannst.github.io/notes/arch/x86_64.html#model-specific-register-msr</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">MSR_EFER</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">0xc000_0080</span>;
<span class="doccomment">/// Long Mode Enable.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When set enables long mode operations.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">EFER_LME</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">8</span>;
<span class="doccomment">/// Long Mode Active (readonly).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When set indicates long mode is active.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">EFER_LMA</span>: <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">10</span>;
<span class="comment">/* Paging */</span>
<span class="doccomment">/// Page entry present.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">PAGE_ENTRY_PRESENT</span> : <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">0</span>;
<span class="doccomment">/// Page region read/write.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If set, region reference by paging entry is writeable.</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">PAGE_RENTRY_RW</span> : <span class="ident">u64</span> <span class="op">=</span> <span class="number">1</span> <span class="op"><</span><span class="op"><</span> <span class="number">1</span>;
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